feat: add domain verification notification (#649)

* fix: dont (re)generate client secret with auth type none * fix(cors): allow Origin from request * feat: add origin allow list and fix some core issues * rename migration * fix UserIDsByDomain * feat: send email to users after domain claim * username * check origin on userinfo * update oidc pkg * fix: add migration 1.6 * change username * change username * remove unique email aggregate * change username in mgmt * search global user by login name * fix test * change user search in angular * fix tests * merge * userview in angular * fix merge * Update pkg/grpc/management/proto/management.proto Co-authored-by: Fabi <38692350+fgerschwiler@users.noreply.github.com> * Update internal/notification/static/i18n/de.yaml Co-authored-by: Fabi <38692350+fgerschwiler@users.noreply.github.com> * fix Co-authored-by: Fabi <38692350+fgerschwiler@users.noreply.github.com>
2025-02-28 23:37:23 +00:00 · 2020-08-27 17:18:23 +02:00 · 2020-08-27 17:18:23 +02:00 · 34ec2508d3
commit 34ec2508d3
parent 3f714679d1
73 changed files with 19105 additions and 17845 deletions
--- a/cmd/zitadel/authz.yaml
+++ b/cmd/zitadel/authz.yaml
@ -23,6 +23,7 @@ InternalAuthZ:
        - "org.idp.write"
        - "org.idp.delete"
        - "user.read"
+        - "user.global.read"
        - "user.write"
        - "user.delete"
        - "user.grant.read"
@ -66,6 +67,7 @@ InternalAuthZ:
        - "org.member.read"
        - "org.idp.read"
        - "user.read"
+        - "user.global.read"
        - "user.grant.read"
        - "user.membership.read"
        - "policy.read"
@ -89,6 +91,7 @@ InternalAuthZ:
        - "org.idp.write"
        - "org.idp.delete"
        - "user.read"
+        - "user.global.read"
        - "user.write"
        - "user.delete"
        - "user.grant.read"
@ -127,6 +130,7 @@ InternalAuthZ:
        - "org.member.read"
        - "org.idp.read"
        - "user.read"
+        - "user.global.read"
        - "user.grant.read"
        - "user.membership.read"
        - "policy.read"
@ -143,6 +147,7 @@ InternalAuthZ:
        - "org.read"
        - "org.member.read"
        - "user.read"
+        - "user.global.read"
        - "user.grant.read"
        - "user.grant.write"
        - "user.grant.delete"
@ -158,6 +163,7 @@ InternalAuthZ:
        - "org.read"
        - "org.member.read"
        - "user.read"
+        - "user.global.read"
        - "user.grant.read"
        - "user.grant.write"
        - "user.grant.delete"
@ -172,6 +178,7 @@ InternalAuthZ:
        - "project.grant.member.read"
    - Role: 'ORG_PROJECT_CREATOR'
      Permissions:
+        - "user.global.read"
        - "project.read:self"
        - "project.write"
    - Role: 'PROJECT_OWNER'
@ -195,6 +202,7 @@ InternalAuthZ:
        - "project.grant.member.write"
        - "project.grant.member.delete"
        - "user.read"
+        - "user.global.read"
        - "user.grant.read"
        - "user.grant.write"
        - "user.grant.delete"
@ -208,6 +216,7 @@ InternalAuthZ:
        - "project.grant.read"
        - "project.grant.member.read"
        - "user.read"
+        - "user.global.read"
        - "user.grant.read"
        - "user.membership.read"
    - Role: 'PROJECT_GRANT_OWNER'
@ -218,6 +227,7 @@ InternalAuthZ:
        - "project.grant.member.write"
        - "project.grant.member.delete"
        - "user.read"
+        - "user.global.read"
        - "user.grant.read"
        - "user.grant.write"
        - "user.grant.delete"
@ -228,5 +238,6 @@ InternalAuthZ:
        - "project.grant.read"
        - "project.grant.member.read"
        - "user.read"
+        - "user.global.read"
        - "user.grant.read"
        - "user.membership.read"
--- a/cmd/zitadel/system-defaults.yaml
+++ b/cmd/zitadel/system-defaults.yaml
@ -89,6 +89,7 @@ SystemDefaults:
      InitCode: '$ZITADEL_ACCOUNTS/user/init?userID={{.UserID}}&code={{.Code}}&passwordset={{.PasswordSet}}'
      PasswordReset: '$ZITADEL_ACCOUNTS/password/init?userID={{.UserID}}&code={{.Code}}'
      VerifyEmail: '$ZITADEL_ACCOUNTS/mail/verification?userID={{.UserID}}&code={{.Code}}'
+      DomainClaimed: '$ZITADEL_ACCOUNTS/login'
    Providers:
      Chat:
        Url: $CHAT_URL
@ -133,4 +134,11 @@ SystemDefaults:
        Subject: 'VerifyPhone.Subject'
        Greeting: 'VerifyPhone.Greeting'
        Text: 'VerifyPhone.Text'
-        ButtonText: 'VerifyPhone.ButtonText'
+        ButtonText: 'VerifyPhone.ButtonText'
+      DomainClaimed:
+        Title: 'DomainClaimed.Title'
+        PreHeader: 'DomainClaimed.PreHeader'
+        Subject: 'DomainClaimed.Subject'
+        Greeting: 'DomainClaimed.Greeting'
+        Text: 'DomainClaimed.Text'
+        ButtonText: 'DomainClaimed.ButtonText'
--- a/console/package-lock.json
+++ b/console/package-lock.json
--- a/console/src/app/modules/add-member-dialog/member-create-dialog.component.ts
+++ b/console/src/app/modules/add-member-dialog/member-create-dialog.component.ts
@ -1,6 +1,6 @@
 import { Component, Inject } from '@angular/core';
 import { MAT_DIALOG_DATA, MatDialogRef } from '@angular/material/dialog';
-import { ProjectGrantView, ProjectRole, ProjectView, User } from 'src/app/proto/generated/management_pb';
+import { ProjectGrantView, ProjectRole, ProjectView, UserView } from 'src/app/proto/generated/management_pb';
 import { AdminService } from 'src/app/services/admin.service';
 import { ProjectService } from 'src/app/services/project.service';
 import { ToastService } from 'src/app/services/toast.service';
@ -21,7 +21,7 @@ export enum CreationType {
 export class MemberCreateDialogComponent {
    private projectId: string = '';
    private grantId: string = '';
-    public preselectedUsers: Array<User.AsObject> = [];
+    public preselectedUsers: Array<UserView.AsObject> = [];


    public creationType!: CreationType;
@ -31,7 +31,7 @@ export class MemberCreateDialogComponent {
        CreationType.PROJECT_OWNED,
        CreationType.PROJECT_GRANTED,
    ];
-    public users: Array<User.AsObject> = [];
+    public users: Array<UserView.AsObject> = [];
    public roles: Array<ProjectRole.AsObject> | string[] = [];
    public CreationType: any = CreationType;
    public ProjectAutocompleteType: any = ProjectAutocompleteType;
--- a/console/src/app/modules/project-members/project-members.component.ts
+++ b/console/src/app/modules/project-members/project-members.component.ts
@ -6,7 +6,7 @@ import { MatSelectChange } from '@angular/material/select';
 import { MatTable } from '@angular/material/table';
 import { ActivatedRoute } from '@angular/router';
 import { take } from 'rxjs/operators';
-import { ProjectGrantView, ProjectMember, ProjectType, ProjectView, User } from 'src/app/proto/generated/management_pb';
+import { ProjectGrantView, ProjectMember, ProjectType, ProjectView, UserView } from 'src/app/proto/generated/management_pb';
 import { ProjectService } from 'src/app/services/project.service';
 import { ToastService } from 'src/app/services/toast.service';

@ -128,7 +128,7 @@ export class ProjectMembersComponent {

        dialogRef.afterClosed().subscribe(resp => {
            if (resp) {
-                const users: User.AsObject[] = resp.users;
+                const users: UserView.AsObject[] = resp.users;
                const roles: string[] = resp.roles;

                if (users && users.length && roles && roles.length) {
--- a/console/src/app/modules/search-user-autocomplete/search-user-autocomplete.component.html
+++ b/console/src/app/modules/search-user-autocomplete/search-user-autocomplete.component.html
@ -1,17 +1,17 @@
 <form>
    <mat-form-field *ngIf="target == UserTarget.SELF" appearance="outline" class="full-width">
-        <mat-label>Organizations User Email</mat-label>
+        <mat-label>Organizations User Loginname</mat-label>

-        <input matInput *ngIf="singleOutput" type="text" placeholder="Search for the user email" #usernameInput
+        <input matInput *ngIf="singleOutput" type="text" placeholder="Search for the user loginname" #usernameInput
            [formControl]="myControl" [matAutocomplete]="auto" />

-        <mat-chip-list *ngIf="!singleOutput" #chipList aria-label="useremail selection">
+        <mat-chip-list *ngIf="!singleOutput" #chipList aria-label="loginname selection">
            <mat-chip class="chip" *ngFor="let selecteduser of users" [selectable]="selectable" [removable]="removable"
                (removed)="remove(selecteduser)">
-                {{ selecteduser?.firstName }} {{selecteduser.lastName}} | <small> {{selecteduser.email}}</small>
+                {{ selecteduser?.firstName }} {{selecteduser.lastName}} | <small> {{selecteduser.preferredLoginName}}</small>
                <mat-icon matChipRemove *ngIf="removable">cancel</mat-icon>
            </mat-chip>
-            <input placeholder="{{'ORG_DETAIL.MEMBER.EMAIL' | translate}}" #usernameInput [formControl]="myControl"
+            <input placeholder="{{'ORG_DETAIL.MEMBER.LOGINNAME' | translate}}" #usernameInput [formControl]="myControl"
                [matAutocomplete]="auto" [matChipInputFor]="chipList"
                [matChipInputSeparatorKeyCodes]="separatorKeysCodes" [matChipInputAddOnBlur]="addOnBlur"
                (matChipInputTokenEnd)="add($event)" />
@ -23,15 +23,15 @@
            </mat-option>
            <mat-option *ngFor="let user of filteredUsers" [value]="user">
                {{user.firstName}} {{user.lastName}}
-                <small>{{user.email}}</small>
+                <small>{{user.preferredLoginName}}</small>
            </mat-option>
        </mat-autocomplete>
    </mat-form-field>

    <div *ngIf="target == UserTarget.EXTERNAL" class="line">
        <mat-form-field class="form-field" appearance="outline">
-            <mat-label>Global User Email</mat-label>
-            <input matInput type="text" [formControl]="globalEmailControl" />
+            <mat-label>Global User Loginname</mat-label>
+            <input matInput type="text" [formControl]="globalLoginNameControl" />
        </mat-form-field>

        <button color="primary" mat-icon-button (click)="getGlobalUser()">
@ -42,7 +42,7 @@
    <div *ngIf="target == UserTarget.EXTERNAL && users.length > 0">
        <span class="found-label">{{'USER.SEARCH.FOUND' | translate}}:</span>
        <div class="found-user-row" *ngFor="let user of users; index as i">
-            <span>{{user.email}}</span>
+            <span>{{user.preferredLoginName}}</span>
            <button mat-icon-button>
                <i class="las la-minus-circle" (click)="users.splice(i, 1)"></i>
            </button>
@ -52,4 +52,4 @@
    <p class="target-desc">{{(target == UserTarget.SELF ? 'USER.TARGET.SELF' : 'USER.TARGET.EXTERNAL') | translate}}
        <a (click)="changeTarget()">{{'USER.TARGET.CLICKHERE' | translate}}</a>
    </p>
-</form>
+</form>
--- a/console/src/app/modules/search-user-autocomplete/search-user-autocomplete.component.ts
+++ b/console/src/app/modules/search-user-autocomplete/search-user-autocomplete.component.ts
@ -5,7 +5,7 @@ import { MatAutocomplete, MatAutocompleteSelectedEvent } from '@angular/material
 import { MatChipInputEvent } from '@angular/material/chips';
 import { from, of, Subject } from 'rxjs';
 import { debounceTime, switchMap, takeUntil, tap } from 'rxjs/operators';
-import { SearchMethod, User, UserSearchKey, UserSearchQuery } from 'src/app/proto/generated/management_pb';
+import { SearchMethod, UserView, UserSearchKey, UserSearchQuery } from 'src/app/proto/generated/management_pb';
 import { MgmtUserService } from 'src/app/services/mgmt-user.service';
 import { ToastService } from 'src/app/services/toast.service';

@ -26,18 +26,18 @@ export class SearchUserAutocompleteComponent {
    public separatorKeysCodes: number[] = [ENTER, COMMA];

    public myControl: FormControl = new FormControl();
-    public globalEmailControl: FormControl = new FormControl();
+    public globalLoginNameControl: FormControl = new FormControl();

-    public emails: string[] = [];
-    @Input() public users: Array<User.AsObject> = [];
-    public filteredUsers: Array<User.AsObject> = [];
+    public loginNames: string[] = [];
+    @Input() public users: Array<UserView.AsObject> = [];
+    public filteredUsers: Array<UserView.AsObject> = [];
    public isLoading: boolean = false;
    public target: UserTarget = UserTarget.SELF;
    public hint: string = '';
    public UserTarget: any = UserTarget;
    @ViewChild('usernameInput') public usernameInput!: ElementRef<HTMLInputElement>;
    @ViewChild('auto') public matAutocomplete!: MatAutocomplete;
-    @Output() public selectionChanged: EventEmitter<User.AsObject | User.AsObject[]> = new EventEmitter();
+    @Output() public selectionChanged: EventEmitter<UserView.AsObject | UserView.AsObject[]> = new EventEmitter();
    @Input() public singleOutput: boolean = false;

    private unsubscribed$: Subject<void> = new Subject();
@ -51,7 +51,7 @@ export class SearchUserAutocompleteComponent {
            tap(() => this.isLoading = true),
            switchMap(value => {
                const query = new UserSearchQuery();
-                query.setKey(UserSearchKey.USERSEARCHKEY_EMAIL);
+                query.setKey(UserSearchKey.USERSEARCHKEY_USER_NAME);
                query.setValue(value);
                query.setMethod(SearchMethod.SEARCHMETHOD_CONTAINS_IGNORE_CASE);
                if (this.target === UserTarget.SELF) {
@ -68,8 +68,8 @@ export class SearchUserAutocompleteComponent {
        });
    }

-    public displayFn(user?: User.AsObject): string | undefined {
-        return user ? `${user.email}` : undefined;
+    public displayFn(user?: UserView.AsObject): string | undefined {
+        return user ? `${user.preferredLoginName}` : undefined;
    }

    public add(event: MatChipInputEvent): void {
@ -79,8 +79,8 @@ export class SearchUserAutocompleteComponent {

            if ((value || '').trim()) {
                const index = this.filteredUsers.findIndex((user) => {
-                    if (user.email) {
-                        return user.email === value;
+                    if (user.preferredLoginName) {
+                        return user.preferredLoginName === value;
                    }
                });
                if (index > -1) {
@ -98,7 +98,7 @@ export class SearchUserAutocompleteComponent {
        }
    }

-    public remove(user: User.AsObject): void {
+    public remove(user: UserView.AsObject): void {
        const index = this.users.indexOf(user);

        if (index >= 0) {
@ -138,7 +138,7 @@ export class SearchUserAutocompleteComponent {
    }

    public getGlobalUser(): void {
-        this.userService.GetUserByEmailGlobal(this.globalEmailControl.value).then(user => {
+        this.userService.GetUserByLoginNameGlobal(this.globalLoginNameControl.value).then(user => {
            this.users = [user.toObject()];
            this.selectionChanged.emit(this.users);
        }).catch(error => {
--- a/console/src/app/pages/projects/owned-projects/owned-project-detail/owned-project-detail.component.ts
+++ b/console/src/app/pages/projects/owned-projects/owned-project-detail/owned-project-detail.component.ts
@ -22,7 +22,7 @@ import {
    ProjectState,
    ProjectType,
    ProjectView,
-    User,
+    UserView,
    UserGrantSearchKey,
 } from 'src/app/proto/generated/management_pb';
 import { OrgService } from 'src/app/services/org.service';
@ -216,7 +216,7 @@ export class OwnedProjectDetailComponent implements OnInit, OnDestroy {

        dialogRef.afterClosed().subscribe(resp => {
            if (resp) {
-                const users: User.AsObject[] = resp.users;
+                const users: UserView.AsObject[] = resp.users;
                const roles: string[] = resp.roles;

                if (users && users.length && roles && roles.length) {
--- a/console/src/app/pages/users/user-detail/memberships/memberships.component.ts
+++ b/console/src/app/pages/users/user-detail/memberships/memberships.component.ts
@ -3,7 +3,7 @@ import { Component, Input, OnInit } from '@angular/core';
 import { MatDialog } from '@angular/material/dialog';
 import { Router } from '@angular/router';
 import { CreationType, MemberCreateDialogComponent } from 'src/app/modules/add-member-dialog/member-create-dialog.component';
-import { MemberType, User, UserMembershipSearchResponse } from 'src/app/proto/generated/management_pb';
+import { MemberType, UserView, UserMembershipSearchResponse } from 'src/app/proto/generated/management_pb';
 import { AdminService } from 'src/app/services/admin.service';
 import { MgmtUserService } from 'src/app/services/mgmt-user.service';
 import { OrgService } from 'src/app/services/org.service';
@ -35,7 +35,7 @@ export class MembershipsComponent implements OnInit {
    public loading: boolean = false;
    public memberships!: UserMembershipSearchResponse.AsObject;

-    @Input() public user!: User.AsObject;
+    @Input() public user!: UserView.AsObject;
    public MemberType: any = MemberType;

    constructor(
@ -92,7 +92,7 @@ export class MembershipsComponent implements OnInit {
    }

    public createIamMember(response: any): void {
-        const users: User.AsObject[] = response.users;
+        const users: UserView.AsObject[] = response.users;
        const roles: string[] = response.roles;

        if (users && users.length && roles && roles.length) {
@ -107,7 +107,7 @@ export class MembershipsComponent implements OnInit {
    }

    private createOrgMember(response: any): void {
-        const users: User.AsObject[] = response.users;
+        const users: UserView.AsObject[] = response.users;
        const roles: string[] = response.roles;

        if (users && users.length && roles && roles.length) {
@ -122,7 +122,7 @@ export class MembershipsComponent implements OnInit {
    }

    private createGrantedProjectMember(response: any): void {
-        const users: User.AsObject[] = response.users;
+        const users: UserView.AsObject[] = response.users;
        const roles: string[] = response.roles;

        if (users && users.length && roles && roles.length) {
@ -142,7 +142,7 @@ export class MembershipsComponent implements OnInit {
    }

    private createOwnedProjectMember(response: any): void {
-        const users: User.AsObject[] = response.users;
+        const users: UserView.AsObject[] = response.users;
        const roles: string[] = response.roles;

        if (users && users.length && roles && roles.length) {
--- a/console/src/app/services/mgmt-user.service.ts
+++ b/console/src/app/services/mgmt-user.service.ts
@ -7,7 +7,7 @@ import {
    ChangeRequest,
    Changes,
    CreateUserRequest,
-    Email,
+    LoginName,
    Gender,
    MultiFactors,
    NotificationType,
@ -391,11 +391,11 @@ export class MgmtUserService {
        );
    }

-    public async GetUserByEmailGlobal(email: string): Promise<User> {
-        const req = new Email();
-        req.setEmail(email);
+    public async GetUserByLoginNameGlobal(loginName: string): Promise<UserView> {
+        const req = new LoginName();
+        req.setLoginName(loginName);
        return await this.request(
-            c => c.getUserByEmailGlobal,
+            c => c.getUserByLoginNameGlobal,
            req,
            f => f,
        );
--- a/go.sum
+++ b/go.sum
@ -44,8 +44,6 @@ github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/DATA-DOG/go-sqlmock v1.4.1 h1:ThlnYciV1iM/V0OSF/dtkqWb6xo5qITT1TJBG1MRDJM=
-github.com/DATA-DOG/go-sqlmock v1.4.1/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
 github.com/DATA-DOG/go-sqlmock v1.5.0 h1:Shsta01QNfFxHCfpW6YH2STWB0MudeXXEWMr20OEh60=
 github.com/DATA-DOG/go-sqlmock v1.5.0/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
 github.com/Masterminds/goutils v1.1.0 h1:zukEsf/1JZwCMgHiK3GZftabmxiCw4apj3a28RPBiVg=
--- a/internal/admin/repository/eventsourcing/handler/user.go
+++ b/internal/admin/repository/eventsourcing/handler/user.go
@ -80,7 +80,8 @@ func (u *User) ProcessUser(event *models.Event) (err error) {
 			return err
 		}
 		err = user.AppendEvent(event)
-	case es_model.DomainClaimed:
+	case es_model.DomainClaimed,
+		es_model.UserUserNameChanged:
 		user, err = u.view.UserByID(event.AggregateID)
 		if err != nil {
 			return err
--- a/internal/admin/repository/eventsourcing/view/user.go
+++ b/internal/admin/repository/eventsourcing/view/user.go
@ -19,8 +19,8 @@ func (v *View) SearchUsers(request *usr_model.UserSearchRequest) ([]*model.UserV
 	return view.SearchUsers(v.Db, userTable, request)
 }

-func (v *View) GetGlobalUserByEmail(email string) (*model.UserView, error) {
-	return view.GetGlobalUserByEmail(v.Db, userTable, email)
+func (v *View) GetGlobalUserByLoginName(loginName string) (*model.UserView, error) {
+	return view.GetGlobalUserByLoginName(v.Db, userTable, loginName)
 }

 func (v *View) UsersByOrgID(orgID string) ([]*model.UserView, error) {
--- a/internal/api/grpc/auth/user.go
+++ b/internal/api/grpc/auth/user.go
@ -69,6 +69,10 @@ func (s *Server) UpdateMyUserProfile(ctx context.Context, request *auth.UpdateUs
 	return profileFromModel(profile), nil
 }

+func (s *Server) ChangeMyUserName(ctx context.Context, request *auth.ChangeUserNameRequest) (*empty.Empty, error) {
+	return &empty.Empty{}, s.repo.ChangeMyUsername(ctx, request.UserName)
+}
+
 func (s *Server) ChangeMyUserEmail(ctx context.Context, request *auth.UpdateUserEmailRequest) (*auth.UserEmail, error) {
 	email, err := s.repo.ChangeMyEmail(ctx, updateEmailToModel(ctx, request))
 	if err != nil {
--- a/internal/api/grpc/management/user.go
+++ b/internal/api/grpc/management/user.go
@ -5,8 +5,7 @@ import (

 	"github.com/golang/protobuf/ptypes/empty"

-	grpc_util "github.com/caos/zitadel/internal/api/grpc"
-	"github.com/caos/zitadel/internal/api/http"
+	"github.com/caos/zitadel/internal/api/authz"
 	"github.com/caos/zitadel/internal/errors"
 	"github.com/caos/zitadel/pkg/grpc/management"
 )
@ -19,8 +18,8 @@ func (s *Server) GetUserByID(ctx context.Context, id *management.UserID) (*manag
 	return userViewFromModel(user), nil
 }

-func (s *Server) GetUserByEmailGlobal(ctx context.Context, email *management.Email) (*management.UserView, error) {
-	user, err := s.user.GetGlobalUserByEmail(ctx, email.Email)
+func (s *Server) GetUserByLoginNameGlobal(ctx context.Context, loginName *management.LoginName) (*management.UserView, error) {
+	user, err := s.user.GetUserByLoginNameGlobal(ctx, loginName.LoginName)
 	if err != nil {
 		return nil, err
 	}
@ -29,8 +28,7 @@ func (s *Server) GetUserByEmailGlobal(ctx context.Context, email *management.Ema

 func (s *Server) SearchUsers(ctx context.Context, in *management.UserSearchRequest) (*management.UserSearchResponse, error) {
 	request := userSearchRequestsToModel(in)
-	orgID := grpc_util.GetHeader(ctx, http.ZitadelOrgID)
-	request.AppendMyOrgQuery(orgID)
+	request.AppendMyOrgQuery(authz.GetCtxData(ctx).OrgID)
 	response, err := s.user.SearchUsers(ctx, request)
 	if err != nil {
 		return nil, err
@ -106,6 +104,10 @@ func (s *Server) GetUserProfile(ctx context.Context, in *management.UserID) (*ma
 	return profileViewFromModel(profile), nil
 }

+func (s *Server) ChangeUserUserName(ctx context.Context, request *management.UpdateUserUserNameRequest) (*empty.Empty, error) {
+	return &empty.Empty{}, s.user.ChangeUsername(ctx, request.Id, request.UserName)
+}
+
 func (s *Server) UpdateUserProfile(ctx context.Context, request *management.UpdateUserProfileRequest) (*management.UserProfile, error) {
 	profile, err := s.user.ChangeProfile(ctx, updateProfileToModel(request))
 	if err != nil {
--- a/internal/api/oidc/op.go
+++ b/internal/api/oidc/op.go
@ -59,6 +59,7 @@ func NewProvider(ctx context.Context, config OPHandlerConfig, repo repository.Re
 			middleware.NoCacheInterceptor(http_utils.CopyHeadersToContext(handlerFunc))
 		}
 	}
+	config.OPConfig.CodeMethodS256 = true
 	provider, err := op.NewDefaultOP(
 		ctx,
 		config.OPConfig,
--- a/internal/auth/repository/eventsourcing/eventstore/auth_request.go
+++ b/internal/auth/repository/eventsourcing/eventstore/auth_request.go
@ -239,8 +239,11 @@ func (repo *AuthRequestRepo) nextSteps(ctx context.Context, request *model.AuthR
 	if !user.IsEmailVerified {
 		steps = append(steps, &model.VerifyEMailStep{})
 	}
+	if user.UsernameChangeRequired {
+		steps = append(steps, &model.ChangeUsernameStep{})
+	}

-	if user.PasswordChangeRequired || !user.IsEmailVerified {
+	if user.PasswordChangeRequired || !user.IsEmailVerified || user.UsernameChangeRequired {
 		return steps, nil
 	}

--- a/internal/auth/repository/eventsourcing/eventstore/user.go
+++ b/internal/auth/repository/eventsourcing/eventstore/user.go
@ -220,6 +220,14 @@ func (repo *UserRepo) RemoveMyMfaOTP(ctx context.Context) error {
 	return repo.UserEvents.RemoveOTP(ctx, authz.GetCtxData(ctx).UserID)
 }

+func (repo *UserRepo) ChangeMyUsername(ctx context.Context, username string) error {
+	ctxData := authz.GetCtxData(ctx)
+	orgPolicy, err := repo.OrgEvents.GetOrgIAMPolicy(ctx, ctxData.OrgID)
+	if err != nil {
+		return err
+	}
+	return repo.UserEvents.ChangeUsername(ctx, ctxData.UserID, username, orgPolicy)
+}
 func (repo *UserRepo) ResendInitVerificationMail(ctx context.Context, userID string) error {
 	_, err := repo.UserEvents.CreateInitializeUserCodeByID(ctx, userID)
 	return err
@ -299,6 +307,15 @@ func (repo *UserRepo) MyUserChanges(ctx context.Context, lastSequence uint64, li
 	return changes, nil
 }

+func (repo *UserRepo) ChangeUsername(ctx context.Context, userID, username string) error {
+	policyResourceOwner := authz.GetCtxData(ctx).OrgID
+	orgPolicy, err := repo.OrgEvents.GetOrgIAMPolicy(ctx, policyResourceOwner)
+	if err != nil {
+		return err
+	}
+	return repo.UserEvents.ChangeUsername(ctx, userID, username, orgPolicy)
+}
+
 func checkIDs(ctx context.Context, obj es_models.ObjectRoot) error {
 	if obj.AggregateID != authz.GetCtxData(ctx).UserID {
 		return errors.ThrowPermissionDenied(nil, "EVENT-kFi9w", "object does not belong to user")
--- a/internal/auth/repository/eventsourcing/handler/user.go
+++ b/internal/auth/repository/eventsourcing/handler/user.go
@ -83,7 +83,8 @@ func (u *User) ProcessUser(event *models.Event) (err error) {
 			return err
 		}
 		err = user.AppendEvent(event)
-	case es_model.DomainClaimed:
+	case es_model.DomainClaimed,
+		es_model.UserUserNameChanged:
 		user, err = u.view.UserByID(event.AggregateID)
 		if err != nil {
 			return err
--- a/internal/auth/repository/eventsourcing/handler/user_session.go
+++ b/internal/auth/repository/eventsourcing/handler/user_session.go
@ -65,7 +65,9 @@ func (u *UserSession) Reduce(event *models.Event) (err error) {
 		es_model.MfaOtpRemoved,
 		es_model.UserProfileChanged,
 		es_model.UserLocked,
-		es_model.UserDeactivated:
+		es_model.UserDeactivated,
+		es_model.DomainClaimed,
+		es_model.UserUserNameChanged:
 		sessions, err := u.view.UserSessionsByUserID(event.AggregateID)
 		if err != nil {
 			return err
--- a/internal/auth/repository/eventsourcing/view/user.go
+++ b/internal/auth/repository/eventsourcing/view/user.go
@ -35,8 +35,8 @@ func (v *View) SearchUsers(request *usr_model.UserSearchRequest) ([]*model.UserV
 	return view.SearchUsers(v.Db, userTable, request)
 }

-func (v *View) GetGlobalUserByEmail(email string) (*model.UserView, error) {
-	return view.GetGlobalUserByEmail(v.Db, userTable, email)
+func (v *View) GetGlobalUserByLoginName(email string) (*model.UserView, error) {
+	return view.GetGlobalUserByLoginName(v.Db, userTable, email)
 }

 func (v *View) IsUserUnique(userName, email string) (bool, error) {
--- a/internal/auth/repository/repository.go
+++ b/internal/auth/repository/repository.go
@ -15,4 +15,5 @@ type Repository interface {
 	UserGrantRepository
 	PolicyRepository
 	OrgRepository
+	IAMRepository
 }
--- a/internal/auth/repository/user.go
+++ b/internal/auth/repository/user.go
@ -21,9 +21,14 @@ type UserRepository interface {
 	VerifyEmail(ctx context.Context, userID, code string) error
 	ResendEmailVerificationMail(ctx context.Context, userID string) error

+	VerifyInitCode(ctx context.Context, userID, code, password string) error
+	ResendInitVerificationMail(ctx context.Context, userID string) error
+
 	AddMfaOTP(ctx context.Context, userID string) (*model.OTP, error)
 	VerifyMfaOTPSetup(ctx context.Context, userID, code string) error

+	ChangeUsername(ctx context.Context, userID, username string) error
+
 	SignOut(ctx context.Context, agentID string) error

 	UserByID(ctx context.Context, userID string) (*model.UserView, error)
@ -56,5 +61,7 @@ type myUserRepo interface {
 	VerifyMyMfaOTPSetup(ctx context.Context, code string) error
 	RemoveMyMfaOTP(ctx context.Context) error

+	ChangeMyUsername(ctx context.Context, username string) error
+
 	MyUserChanges(ctx context.Context, lastSequence uint64, limit uint64, sortAscending bool) (*model.UserChanges, error)
 }
--- a/internal/auth_request/model/next_step.go
+++ b/internal/auth_request/model/next_step.go
@ -18,6 +18,7 @@ const (
 	NextStepMfaPrompt
 	NextStepMfaVerify
 	NextStepRedirectToCallback
+	NextStepChangeUsername
 )

 type UserSessionState int32
@ -74,6 +75,12 @@ func (s *InitPasswordStep) Type() NextStepType {
 	return NextStepInitPassword
 }

+type ChangeUsernameStep struct{}
+
+func (s *ChangeUsernameStep) Type() NextStepType {
+	return NextStepChangeUsername
+}
+
 type VerifyEMailStep struct{}

 func (s *VerifyEMailStep) Type() NextStepType {
--- a/internal/config/systemdefaults/system_defaults.go
+++ b/internal/config/systemdefaults/system_defaults.go
@ -81,6 +81,7 @@ type Endpoints struct {
 	InitCode      string
 	PasswordReset string
 	VerifyEmail   string
+	DomainClaimed string
 }

 type Providers struct {
@ -94,4 +95,5 @@ type TemplateData struct {
 	PasswordReset templates.TemplateData
 	VerifyEmail   templates.TemplateData
 	VerifyPhone   templates.TemplateData
+	DomainClaimed templates.TemplateData
 }
--- a/internal/management/repository/eventsourcing/eventstore/user.go
+++ b/internal/management/repository/eventsourcing/eventstore/user.go
@ -132,8 +132,8 @@ func (repo *UserRepo) UserChanges(ctx context.Context, id string, lastSequence u
 	return changes, nil
 }

-func (repo *UserRepo) GetGlobalUserByEmail(ctx context.Context, email string) (*usr_model.UserView, error) {
-	user, err := repo.View.GetGlobalUserByEmail(email)
+func (repo *UserRepo) GetUserByLoginNameGlobal(ctx context.Context, loginName string) (*usr_model.UserView, error) {
+	user, err := repo.View.GetGlobalUserByLoginName(loginName)
 	if err != nil {
 		return nil, err
 	}
@ -179,6 +179,14 @@ func (repo *UserRepo) ChangeProfile(ctx context.Context, profile *usr_model.Prof
 	return repo.UserEvents.ChangeProfile(ctx, profile)
 }

+func (repo *UserRepo) ChangeUsername(ctx context.Context, userID, userName string) error {
+	orgPolicy, err := repo.OrgEvents.GetOrgIAMPolicy(ctx, authz.GetCtxData(ctx).OrgID)
+	if err != nil {
+		return err
+	}
+	return repo.UserEvents.ChangeUsername(ctx, userID, userName, orgPolicy)
+}
+
 func (repo *UserRepo) EmailByID(ctx context.Context, userID string) (*usr_model.Email, error) {
 	user, err := repo.UserByID(ctx, userID)
 	if err != nil {
--- a/internal/management/repository/eventsourcing/handler/user.go
+++ b/internal/management/repository/eventsourcing/handler/user.go
@ -80,7 +80,8 @@ func (u *User) ProcessUser(event *models.Event) (err error) {
 			return err
 		}
 		err = user.AppendEvent(event)
-	case es_model.DomainClaimed:
+	case es_model.DomainClaimed,
+		es_model.UserUserNameChanged:
 		user, err = u.view.UserByID(event.AggregateID)
 		if err != nil {
 			return err
--- a/internal/management/repository/eventsourcing/view/user.go
+++ b/internal/management/repository/eventsourcing/view/user.go
@ -19,8 +19,8 @@ func (v *View) SearchUsers(request *usr_model.UserSearchRequest) ([]*model.UserV
 	return view.SearchUsers(v.Db, userTable, request)
 }

-func (v *View) GetGlobalUserByEmail(email string) (*model.UserView, error) {
-	return view.GetGlobalUserByEmail(v.Db, userTable, email)
+func (v *View) GetGlobalUserByLoginName(loginName string) (*model.UserView, error) {
+	return view.GetGlobalUserByLoginName(v.Db, userTable, loginName)
 }

 func (v *View) UsersByOrgID(orgID string) ([]*model.UserView, error) {
--- a/internal/management/repository/user.go
+++ b/internal/management/repository/user.go
@ -16,7 +16,7 @@ type UserRepository interface {
 	UnlockUser(ctx context.Context, id string) (*model.User, error)
 	SearchUsers(ctx context.Context, request *model.UserSearchRequest) (*model.UserSearchResponse, error)
 	UserChanges(ctx context.Context, id string, lastSequence uint64, limit uint64, sortAscending bool) (*model.UserChanges, error)
-	GetGlobalUserByEmail(ctx context.Context, email string) (*model.UserView, error)
+	GetUserByLoginNameGlobal(ctx context.Context, email string) (*model.UserView, error)
 	IsUserUnique(ctx context.Context, userName, email string) (bool, error)
 	UserMfas(ctx context.Context, userID string) ([]*model.MultiFactor, error)

@ -26,6 +26,8 @@ type UserRepository interface {
 	ProfileByID(ctx context.Context, userID string) (*model.Profile, error)
 	ChangeProfile(ctx context.Context, profile *model.Profile) (*model.Profile, error)

+	ChangeUsername(ctx context.Context, id, username string) error
+
 	EmailByID(ctx context.Context, userID string) (*model.Email, error)
 	ChangeEmail(ctx context.Context, email *model.Email) (*model.Email, error)
 	CreateEmailVerificationCode(ctx context.Context, userID string) error
--- a/internal/notification/repository/eventsourcing/handler/notification.go
+++ b/internal/notification/repository/eventsourcing/handler/notification.go
@ -2,6 +2,7 @@ package handler

 import (
 	"context"
+	"encoding/json"
 	"net/http"

 	"github.com/caos/logging"
@ -9,6 +10,7 @@ import (
 	"github.com/caos/zitadel/internal/api/authz"
 	sd "github.com/caos/zitadel/internal/config/systemdefaults"
 	"github.com/caos/zitadel/internal/crypto"
+	caos_errs "github.com/caos/zitadel/internal/errors"
 	"github.com/caos/zitadel/internal/eventstore"
 	"github.com/caos/zitadel/internal/eventstore/models"
 	"github.com/caos/zitadel/internal/eventstore/spooler"
@ -56,6 +58,8 @@ func (n *Notification) Reduce(event *models.Event) (err error) {
 		err = n.handlePhoneVerificationCode(event)
 	case es_model.UserPasswordCodeAdded:
 		err = n.handlePasswordCode(event)
+	case es_model.DomainClaimed:
+		err = n.handleDomainClaimed(event)
 	default:
 		return n.view.ProcessedNotificationSequence(event.Sequence)
 	}
@ -137,6 +141,27 @@ func (n *Notification) handlePhoneVerificationCode(event *models.Event) (err err
 	return n.userEvents.PhoneVerificationCodeSent(getSetNotifyContextData(event.ResourceOwner), event.AggregateID)
 }

+func (n *Notification) handleDomainClaimed(event *models.Event) (err error) {
+	alreadyHandled, err := n.checkIfCodeAlreadyHandled(event.AggregateID, event.Sequence, es_model.DomainClaimed, es_model.DomainClaimedSent)
+	if err != nil || alreadyHandled {
+		return nil
+	}
+	data := make(map[string]string)
+	if err := json.Unmarshal(event.Data, &data); err != nil {
+		logging.Log("HANDLE-Gghq2").WithError(err).Error("could not unmarshal event data")
+		return caos_errs.ThrowInternal(err, "HANDLE-7hgj3", "could not unmarshal event")
+	}
+	user, err := n.view.NotifyUserByID(event.AggregateID)
+	if err != nil {
+		return err
+	}
+	err = types.SendDomainClaimed(n.statikDir, n.i18n, user, data["userName"], n.systemDefaults)
+	if err != nil {
+		return err
+	}
+	return n.userEvents.DomainClaimedSent(getSetNotifyContextData(event.ResourceOwner), event.AggregateID)
+}
+
 func (n *Notification) checkIfCodeAlreadyHandled(userID string, sequence uint64, addedType, sentType models.EventType) (bool, error) {
 	events, err := n.getUserEvents(userID, sequence)
 	if err != nil {
--- a/internal/notification/repository/eventsourcing/handler/notify_user.go
+++ b/internal/notification/repository/eventsourcing/handler/notify_user.go
@ -69,6 +69,17 @@ func (u *NotifyUser) ProcessUser(event *models.Event) (err error) {
 			return err
 		}
 		err = user.AppendEvent(event)
+	case es_model.DomainClaimed,
+		es_model.UserUserNameChanged:
+		user, err = u.view.NotifyUserByID(event.AggregateID)
+		if err != nil {
+			return err
+		}
+		err = user.AppendEvent(event)
+		if err != nil {
+			return err
+		}
+		u.fillLoginNames(user)
 	case es_model.UserRemoved:
 		err = u.view.DeleteNotifyUser(event.AggregateID, event.Sequence)
 	default:
--- a/internal/notification/static/i18n/de.yaml
+++ b/internal/notification/static/i18n/de.yaml
@ -26,4 +26,10 @@ VerifyPhone:
  Greeting: Hallo {{.FirstName}} {{.LastName}},
  Text: Eine Telefonnummer wurde hinzugefügt. Bitte verifiziere diese in dem du folgenden Code eingibst {{.Code}}
  ButtonText: Telefon verifizieren
-
+DomainClaimed:
+  Title: Zitadel - Domain wurde beansprucht
+  PreHeader: Email / Username ändern
+  Subject: Domain wurde beansprucht
+  Greeting: Hallo {{.FirstName}} {{.LastName}},
+  Text: Die Domain {{.Domain}} wurde von einer Organisation beansprucht. Dein derzeitiger User {{.Username}} ist nicht Teil dieser Organisation. Daher musst du beim nächsten Login eine neue Email hinterlegen. Für diesen Login haben wir dir einen temporären Usernamen ({{.TempUsername}}) erstellt.
+  ButtonText: Login
--- a/internal/notification/static/i18n/en.yaml
+++ b/internal/notification/static/i18n/en.yaml
@ -26,4 +26,10 @@ VerifyPhone:
  Greeting: Hello {{.FirstName}} {{.LastName}},
  Text: A new phonenumber has been added. Please use the following code to verify it {{.Code}}
  ButtonText: Verify phone
-
+DomainClaimed:
+  Title: Zitadel - Domain has been claimed
+  PreHeader: Change email / username
+  Subject: Domain has been claimed
+  Greeting: Hello {{.FirstName}} {{.LastName}},
+  Text: The domain {{.Domain}} has been claimed by an organisation. Your current user {{.Username}} is not part of this organisation. Therefore you'll have to change your email when you login. We have created a temporary username ({{.TempUsername}}) for this login.
+  ButtonText: Login
--- a/internal/notification/types/domain_claimed.go
+++ b/internal/notification/types/domain_claimed.go
@ -0,0 +1,37 @@
+package types
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/caos/zitadel/internal/config/systemdefaults"
+	"github.com/caos/zitadel/internal/i18n"
+	"github.com/caos/zitadel/internal/notification/templates"
+	view_model "github.com/caos/zitadel/internal/user/repository/view/model"
+)
+
+type DomainClaimedData struct {
+	templates.TemplateData
+	URL string
+}
+
+func SendDomainClaimed(dir http.FileSystem, i18n *i18n.Translator, user *view_model.NotifyUser, username string, systemDefaults systemdefaults.SystemDefaults) error {
+	url, err := templates.ParseTemplateText(systemDefaults.Notifications.Endpoints.DomainClaimed, &UrlData{UserID: user.ID})
+	if err != nil {
+		return err
+	}
+	var args = map[string]interface{}{
+		"FirstName":    user.FirstName,
+		"LastName":     user.LastName,
+		"Username":     user.LastEmail,
+		"TempUsername": username,
+		"Domain":       strings.Split(user.LastEmail, "@")[1],
+	}
+	systemDefaults.Notifications.TemplateData.DomainClaimed.Translate(i18n, args, user.PreferredLanguage)
+	data := &DomainClaimedData{TemplateData: systemDefaults.Notifications.TemplateData.DomainClaimed, URL: url}
+	template, err := templates.GetParsedTemplate(dir, data)
+	if err != nil {
+		return err
+	}
+	return generateEmail(user, systemDefaults.Notifications.TemplateData.DomainClaimed.Subject, template, systemDefaults.Notifications, true)
+}
--- a/internal/static/i18n/en.yaml
+++ b/internal/static/i18n/en.yaml
@ -8,7 +8,7 @@ Errors:
    OrgIamPolicyNil: Organisation Policy is empty
    EmailAsUsernameNotAllowed: Email is not allowed as username
    Invalid: Userdata is invalid
-    DomainNotAllowedAsUsername: Domain is already reserved
+    DomainNotAllowedAsUsername: Domain is already reserved and cannot be used
    AlreadyInactive: User already inactive
    NotInactive: User is not inactive
    ShouldBeActiveOrInitial: User is not active or inital
--- a/internal/ui/login/handler/login.go
+++ b/internal/ui/login/handler/login.go
@ -12,6 +12,7 @@ import (

 	"github.com/caos/zitadel/internal/api/authz"
 	"github.com/caos/zitadel/internal/api/http/middleware"
+	auth_repository "github.com/caos/zitadel/internal/auth/repository"
 	"github.com/caos/zitadel/internal/auth/repository/eventsourcing"
 	"github.com/caos/zitadel/internal/crypto"
 	"github.com/caos/zitadel/internal/form"
@ -23,7 +24,7 @@ type Login struct {
 	router              http.Handler
 	renderer            *Renderer
 	parser              *form.Parser
-	authRepo            *eventsourcing.EsRepository
+	authRepo            auth_repository.Repository
 	zitadelURL          string
 	oidcAuthCallbackURL string
 }
--- a/internal/ui/login/handler/renderer.go
+++ b/internal/ui/login/handler/renderer.go
@ -53,6 +53,8 @@ func CreateRenderer(pathPrefix string, staticDir http.FileSystem, cookieName str
 		tmplRegister:           "register.html",
 		tmplLogoutDone:         "logout_done.html",
 		tmplRegisterOrg:        "register_org.html",
+		tmplChangeUsername:     "change_username.html",
+		tmplChangeUsernameDone: "change_username_done.html",
 	}
 	funcs := map[string]interface{}{
 		"resourceUrl": func(file string) string {
@ -112,6 +114,9 @@ func CreateRenderer(pathPrefix string, staticDir http.FileSystem, cookieName str
 		"orgRegistrationUrl": func() string {
 			return path.Join(r.pathPrefix, EndpointRegisterOrg)
 		},
+		"changeUsernameUrl": func() string {
+			return path.Join(r.pathPrefix, EndpointChangeUsername)
+		},
 		"selectedLanguage": func(l string) bool {
 			return false
 		},
@ -179,6 +184,8 @@ func (l *Login) chooseNextStep(w http.ResponseWriter, r *http.Request, authReq *
 		l.renderMfaPrompt(w, r, authReq, step, err)
 	case *model.InitUserStep:
 		l.renderInitUser(w, r, authReq, "", "", step.PasswordSet, nil)
+	case *model.ChangeUsernameStep:
+		l.renderChangeUsername(w, r, authReq, nil)
 	default:
 		l.renderInternalError(w, r, authReq, caos_errs.ThrowInternal(nil, "APP-ds3QF", "step no possible"))
 	}
--- a/internal/ui/login/handler/router.go
+++ b/internal/ui/login/handler/router.go
@ -13,6 +13,7 @@ const (
 	EndpointLogin            = "/login"
 	EndpointLoginName        = "/loginname"
 	EndpointUserSelection    = "/userselection"
+	EndpointChangeUsername   = "/username/change"
 	EndpointPassword         = "/password"
 	EndpointInitPassword     = "/password/init"
 	EndpointChangePassword   = "/password/change"
@ -40,6 +41,7 @@ func CreateRouter(login *Login, staticDir http.FileSystem, interceptors ...mux.M
 	router.HandleFunc(EndpointLoginName, login.handleLoginName).Methods(http.MethodGet)
 	router.HandleFunc(EndpointLoginName, login.handleLoginNameCheck).Methods(http.MethodPost)
 	router.HandleFunc(EndpointUserSelection, login.handleSelectUser).Methods(http.MethodPost)
+	router.HandleFunc(EndpointChangeUsername, login.handleChangeUsername).Methods(http.MethodPost)
 	router.HandleFunc(EndpointPassword, login.handlePasswordCheck).Methods(http.MethodPost)
 	router.HandleFunc(EndpointInitPassword, login.handleInitPassword).Methods(http.MethodGet)
 	router.HandleFunc(EndpointInitPassword, login.handleInitPasswordCheck).Methods(http.MethodPost)
--- a/internal/ui/login/handler/username_change_handler.go
+++ b/internal/ui/login/handler/username_change_handler.go
@ -0,0 +1,46 @@
+package handler
+
+import (
+	"net/http"
+
+	"github.com/caos/zitadel/internal/auth_request/model"
+)
+
+const (
+	tmplChangeUsername     = "changeusername"
+	tmplChangeUsernameDone = "changeusernamedone"
+)
+
+type changeUsernameData struct {
+	Username string `schema:"username"`
+}
+
+func (l *Login) renderChangeUsername(w http.ResponseWriter, r *http.Request, authReq *model.AuthRequest, err error) {
+	var errType, errMessage string
+	if err != nil {
+		errMessage = l.getErrorMessage(r, err)
+	}
+	data := l.getUserData(r, authReq, "Change Username", errType, errMessage)
+	l.renderer.RenderTemplate(w, r, l.renderer.Templates[tmplChangeUsername], data, nil)
+}
+
+func (l *Login) handleChangeUsername(w http.ResponseWriter, r *http.Request) {
+	data := new(changeUsernameData)
+	authReq, err := l.getAuthRequestAndParseData(r, data)
+	if err != nil {
+		l.renderError(w, r, authReq, err)
+		return
+	}
+	err = l.authRepo.ChangeUsername(setContext(r.Context(), authReq.UserOrgID), authReq.UserID, data.Username)
+	if err != nil {
+		l.renderChangeUsername(w, r, authReq, err)
+		return
+	}
+	l.renderChangeUsernameDone(w, r, authReq)
+}
+
+func (l *Login) renderChangeUsernameDone(w http.ResponseWriter, r *http.Request, authReq *model.AuthRequest) {
+	var errType, errMessage string
+	data := l.getUserData(r, authReq, "Username Change Done", errType, errMessage)
+	l.renderer.RenderTemplate(w, r, l.renderer.Templates[tmplChangeUsernameDone], data, nil)
+}
--- a/internal/ui/login/static/i18n/de.yaml
+++ b/internal/ui/login/static/i18n/de.yaml
@ -21,6 +21,15 @@ UserSelection:
  SessionState0: aktiv
  SessionState1: inaktiv

+UsernameChange:
+  Title: Usernamen ändern
+  Description: Wähle deinen neuen Benutzernamen
+  Username: Benutzernamen
+
+UsernameChangeDone:
+  Title: Username geändert
+  Description: Der Username wurde erfolgreich geändert.
+
 MfaVerify:
  Title: Multifaktor verifizieren
  Description: Verifiziere deinen Multifaktor
@ -153,6 +162,7 @@ Errors:
    NotMatchingUserID: User stimm nicht mit User in Auth Request überein
    UserIDMissing: UserID ist leer
    Invalid: Userdaten sind ungültig
+    DomainNotAllowedAsUsername: Domäne ist bereits reserviert und kann nicht verwendet werden
    Password:
      ConfirmationWrong: Passwort Bestätigung stimmt nicht überein
      Empty: Passwort ist leer
--- a/internal/ui/login/static/i18n/en.yaml
+++ b/internal/ui/login/static/i18n/en.yaml
@ -21,6 +21,15 @@ Password:
  HasNumber: Number
  HasSymbol: Symbol

+UsernameChange:
+  Title: Change Username
+  Description: Set your new username
+  Username: Username
+
+UsernameChangeDone:
+  Title: Username changed
+  Description: Your username was changed successfully.
+
 MfaVerify:
  Title: Verify Multificator
  Description: Verify your multifactor
@ -155,6 +164,7 @@ Errors:
    NotMatchingUserID: User and user in authrequest don't match
    UserIDMissing: UserID is empty
    Invalid: Invalid userdata
+    DomainNotAllowedAsUsername: Domain is already reserved and cannot be used
    Password:
      ConfirmationWrong: Passwordconfirmation is wrong
      Empty: Password is empty
--- a/internal/ui/login/static/resources/scripts/form_submit.js
+++ b/internal/ui/login/static/resources/scripts/form_submit.js
@ -2,6 +2,7 @@ function disableSubmit(checks, button) {
    let form = document.getElementsByTagName('form')[0];
    let inputs = form.getElementsByTagName('input');
    for (i = 0; i < inputs.length; i++) {
+        button.disabled = true;
        inputs[i].addEventListener('input', function () {
            if (checks != undefined) {
                if (checks() === false) {
--- a/internal/ui/login/static/templates/change_password.html
+++ b/internal/ui/login/static/templates/change_password.html
@ -41,7 +41,7 @@
    {{ template "error-message" .}}

    <div class="actions">
-        <button type="submit" id="change-password-button" name="resend" value="false" class="primary right" disabled>{{t "Actions.Next"}}</buttontype="submit">
+        <button type="submit" id="change-password-button" name="resend" value="false" class="primary right">{{t "Actions.Next"}}</button>
        <a href="{{ loginUrl }}">
            <button class="secondary" type="button">{{t "Actions.Cancel"}}</button>
        </a>
--- a/internal/ui/login/static/templates/change_username.html
+++ b/internal/ui/login/static/templates/change_username.html
@ -0,0 +1,35 @@
+{{template "main-top" .}}
+
+{{ template "user-profile" . }}
+
+<p>{{t "UsernameChange.Description"}}</p>
+
+<form action="{{ changeUsernameUrl }}" method="POST">
+
+    {{ .CSRF }}
+
+    <input type="hidden" name="authRequestID" value="{{ .AuthReqID }}" />
+
+    <div class="fields">
+        <div class="field">
+            <label class="label" for="username">{{t "UsernameChange.Username"}}</label>
+            <input class="input" type="text" id="username" name="username" autocomplete="username" autofocus required>
+        </div>
+    </div>
+
+    {{ template "error-message" .}}
+
+    <div class="actions">
+        <button type="submit" id="submit-button" value="false" class="primary right">{{t "Actions.Next"}}</button>
+        <a href="{{ loginUrl }}">
+            <button class="secondary" type="button">{{t "Actions.Cancel"}}</button>
+        </a>
+    </div>
+</form>
+
+<script src="{{ resourceUrl "scripts/form_submit.js" }}"></script>
+<script src="{{ resourceUrl "scripts/default_form_validation.js" }}"></script>
+
+
+{{template "main-bottom" .}}
+ 
--- a/internal/ui/login/static/templates/change_username_done.html
+++ b/internal/ui/login/static/templates/change_username_done.html
@ -0,0 +1,21 @@
+{{template "main-top" .}}
+
+{{ template "user-profile" . }}
+
+<p>{{t "UsernameChangeDone.Description"}}</p>
+
+<form action="{{ loginUrl }}" method="POST">
+
+    {{ .CSRF }}
+
+    <input type="hidden" name="authRequestID" value="{{ .AuthReqID }}" />
+
+
+    <div class="actions">
+        <button class="primary right" type="submit">{{t "Actions.Next"}}</button>
+    </div>
+</form>
+
+
+{{template "main-bottom" .}}
+ 
--- a/internal/ui/login/static/templates/init_user.html
+++ b/internal/ui/login/static/templates/init_user.html
@ -47,8 +47,7 @@
                id="init-button"
                name="resend"
                value="false"
-                class="primary right"
-                {{ if not .PasswordSet }} disabled {{ end }}>{{t "Actions.Next"}}</button>
+                class="primary right">{{t "Actions.Next"}}</button>
        <button type="submit" name="resend" value="true" class="secondary right" formnovalidate>{{t "Actions.Resend" }}</button>
        <a href="{{ loginUrl }}">
            <button class="secondary" type="button">{{t "Actions.Cancel"}}</button>
--- a/internal/ui/login/static/templates/login.html
+++ b/internal/ui/login/static/templates/login.html
@ -20,7 +20,7 @@
    {{template "error-message" .}}

    <div class="actions">
-        <button class="primary right" id="submit-button" type="submit" disabled>{{t "Actions.Next"}}</button>
+        <button class="primary right" id="submit-button" type="submit">{{t "Actions.Next"}}</button>
        <button class="secondary right" name="register" value="true" formnovalidate>{{t "Actions.Register"}}</button>
    </div>
 </form>
--- a/internal/ui/login/static/templates/mail_verification.html
+++ b/internal/ui/login/static/templates/mail_verification.html
@ -21,7 +21,7 @@
    {{ template "error-message" .}}

    <div class="actions">
-        <button type="submit" id="submit-button" name="resend" value="false" class="primary right" disabled>{{t "Actions.Next"}}</button>
+        <button type="submit" id="submit-button" name="resend" value="false" class="primary right">{{t "Actions.Next"}}</button>
        {{ if .UserID }}
        <button type="submit" name="resend" value="true" class="secondary right" formnovalidate>{{t "Actions.Resend"}}</button>
        {{ end }}
--- a/internal/ui/login/static/templates/mfa_init_verify.html
+++ b/internal/ui/login/static/templates/mfa_init_verify.html
@ -34,7 +34,7 @@
    {{end}}

    <div class="actions">
-        <button class="primary right" id="submit-button" type="submit" disabled>{{t "Actions.Next"}}</button>
+        <button class="primary right" id="submit-button" type="submit">{{t "Actions.Next"}}</button>
        <a href="{{ mfaPromptChangeUrl .AuthReqID .MfaType }}">
            <button class="secondary" type="button">{{t "Actions.Back"}}</button>
        </a>
--- a/internal/ui/login/static/templates/mfa_verify.html
+++ b/internal/ui/login/static/templates/mfa_verify.html
@ -21,7 +21,7 @@
    {{ template "error-message" .}}

    <div class="actions">
-        <button class="primary right" id="submit-button" type="submit" disabled>{{t "Actions.Next"}}</button>
+        <button class="primary right" id="submit-button" type="submit">{{t "Actions.Next"}}</button>
        <a href="{{ loginUrl }}">
            <button class="secondary" type="button">{{t "Actions.Cancel"}}</button>
        </a>
--- a/internal/ui/login/static/templates/password.html
+++ b/internal/ui/login/static/templates/password.html
@ -21,7 +21,7 @@
    {{template "error-message" .}}

    <div class="actions">
-        <button id="submit-button" class="primary right" type="submit" disabled>{{t "Actions.Next"}}</button>
+        <button id="submit-button" class="primary right" type="submit">{{t "Actions.Next"}}</button>
        <a href="{{ loginNameChangeUrl .AuthReqID }}">
            <button class="secondary" type="button">{{t "Actions.Back"}}</button>
        </a>
--- a/internal/ui/login/static/templates/register.html
+++ b/internal/ui/login/static/templates/register.html
@ -61,7 +61,7 @@
    {{template "error-message" .}}

    <div class="actions">
-        <button class="primary right" id="register-button" type="submit" disabled>{{t "Actions.Next"}}</button>
+        <button class="primary right" id="register-button" type="submit">{{t "Actions.Next"}}</button>
        <a href="{{ loginNameChangeUrl .AuthReqID }}">
            <button class="secondary" type="button">{{t "Actions.Back"}}</button>
        </a>
--- a/internal/ui/login/static/templates/register_org.html
+++ b/internal/ui/login/static/templates/register_org.html
@ -59,7 +59,7 @@
    {{template "error-message" .}}

    <div class="actions">
-        <button class="primary right" id="register-button" type="submit" disabled>{{t "Actions.Save"}}</button>
+        <button class="primary right" id="register-button" type="submit">{{t "Actions.Save"}}</button>
    </div>
 </form>

--- a/internal/user/model/user_view.go
+++ b/internal/user/model/user_view.go
@ -1,10 +1,12 @@
 package model

 import (
-	"github.com/caos/zitadel/internal/eventstore/models"
-	"golang.org/x/text/language"
 	"time"

+	"golang.org/x/text/language"
+
+	"github.com/caos/zitadel/internal/eventstore/models"
+
 	req_model "github.com/caos/zitadel/internal/auth_request/model"
 	"github.com/caos/zitadel/internal/model"
 )
@ -17,6 +19,7 @@ type UserView struct {
 	ResourceOwner          string
 	PasswordSet            bool
 	PasswordChangeRequired bool
+	UsernameChangeRequired bool
 	PasswordChanged        time.Time
 	LastLogin              time.Time
 	UserName               string
--- a/internal/user/repository/eventsourcing/eventstore.go
+++ b/internal/user/repository/eventsourcing/eventstore.go
@ -670,11 +670,11 @@ func (es *UserEventstore) ChangeEmail(ctx context.Context, email *usr_model.Emai
 	repoNew := model.EmailFromModel(email)
 	repoEmailCode := model.EmailCodeFromModel(emailCode)

-	updateAggregates, err := EmailChangeAggregate(ctx, es.AggregateCreator(), repoExisting, repoNew, repoEmailCode)
+	updateAggregate, err := EmailChangeAggregate(ctx, es.AggregateCreator(), repoExisting, repoNew, repoEmailCode)
 	if err != nil {
 		return nil, err
 	}
-	err = es_sdk.PushAggregates(ctx, es.PushAggregates, repoExisting.AppendEvents, updateAggregates...)
+	err = es_sdk.PushAggregates(ctx, es.PushAggregates, repoExisting.AppendEvents, updateAggregate)
 	if err != nil {
 		return nil, err
 	}
@ -1112,6 +1112,48 @@ func (es *UserEventstore) PrepareDomainClaimed(ctx context.Context, userIDs []st
 	return aggregates, nil
 }

+func (es *UserEventstore) DomainClaimedSent(ctx context.Context, userID string) error {
+	if userID == "" {
+		return caos_errs.ThrowPreconditionFailed(nil, "EVENT-0posw", "Errors.User.UserIDMissing")
+	}
+	user, err := es.UserByID(ctx, userID)
+	if err != nil {
+		return err
+	}
+
+	repoUser := model.UserFromModel(user)
+	agg := DomainClaimedSentAggregate(es.AggregateCreator(), repoUser)
+	err = es_sdk.Push(ctx, es.PushAggregates, repoUser.AppendEvents, agg)
+	if err != nil {
+		return err
+	}
+	es.userCache.cacheUser(repoUser)
+	return nil
+}
+
+func (es *UserEventstore) ChangeUsername(ctx context.Context, userID, username string, orgIamPolicy *org_model.OrgIAMPolicy) error {
+	user, err := es.UserByID(ctx, userID)
+	if err != nil {
+		return err
+	}
+	oldUsername := user.UserName
+	user.UserName = username
+	if err := user.CheckOrgIAMPolicy(orgIamPolicy); err != nil {
+		return err
+	}
+	repoUser := model.UserFromModel(user)
+	aggregates, err := UsernameChangedAggregates(ctx, es.AggregateCreator(), repoUser, oldUsername, orgIamPolicy.UserLoginMustBeDomain)
+	if err != nil {
+		return err
+	}
+	err = es_sdk.PushAggregates(ctx, es.PushAggregates, repoUser.AppendEvents, aggregates...)
+	if err != nil {
+		return err
+	}
+	es.userCache.cacheUser(repoUser)
+	return nil
+}
+
 func (es *UserEventstore) generateTemporaryLoginName() (string, error) {
 	id, err := es.idGenerator.Next()
 	if err != nil {
--- a/internal/user/repository/eventsourcing/model/types.go
+++ b/internal/user/repository/eventsourcing/model/types.go
@ -5,7 +5,6 @@ import "github.com/caos/zitadel/internal/eventstore/models"
 const (
 	UserAggregate         models.AggregateType = "user"
 	UserUserNameAggregate models.AggregateType = "user.username"
-	UserEmailAggregate    models.AggregateType = "user.email"

 	UserAdded                     models.EventType = "user.added"
 	UserRegistered                models.EventType = "user.selfregistered"
@ -16,8 +15,6 @@ const (

 	UserUserNameReserved models.EventType = "user.username.reserved"
 	UserUserNameReleased models.EventType = "user.username.released"
-	UserEmailReserved    models.EventType = "user.email.reserved"
-	UserEmailReleased    models.EventType = "user.email.released"

 	UserLocked      models.EventType = "user.locked"
 	UserUnlocked    models.EventType = "user.unlocked"
@ -44,8 +41,9 @@ const (
 	UserPhoneCodeAdded          models.EventType = "user.phone.code.added"
 	UserPhoneCodeSent           models.EventType = "user.phone.code.sent"

-	UserProfileChanged models.EventType = "user.profile.changed"
-	UserAddressChanged models.EventType = "user.address.changed"
+	UserProfileChanged  models.EventType = "user.profile.changed"
+	UserAddressChanged  models.EventType = "user.address.changed"
+	UserUserNameChanged models.EventType = "user.username.changed"

 	MfaOtpAdded          models.EventType = "user.mfa.otp.added"
 	MfaOtpVerified       models.EventType = "user.mfa.otp.verified"
@ -56,5 +54,6 @@ const (

 	SignedOut models.EventType = "user.signed.out"

-	DomainClaimed models.EventType = "user.domain.claimed"
+	DomainClaimed     models.EventType = "user.domain.claimed"
+	DomainClaimedSent models.EventType = "user.domain.claimed.sent"
 )
--- a/internal/user/repository/eventsourcing/model/user.go
+++ b/internal/user/repository/eventsourcing/model/user.go
@ -134,7 +134,8 @@ func (u *User) AppendEvent(event *es_models.Event) (err error) {
 	case UserAdded,
 		UserRegistered,
 		UserProfileChanged,
-		DomainClaimed:
+		DomainClaimed,
+		UserUserNameChanged:
 		u.setData(event)
 	case UserDeactivated:
 		u.appendDeactivatedEvent()
--- a/internal/user/repository/eventsourcing/user.go
+++ b/internal/user/repository/eventsourcing/user.go
@ -33,14 +33,6 @@ func UserUserNameUniqueQuery(userName string) *es_models.SearchQuery {
 		SetLimit(1)
 }

-func UserEmailUniqueQuery(email string) *es_models.SearchQuery {
-	return es_models.NewSearchQuery().
-		AggregateTypeFilter(model.UserEmailAggregate).
-		AggregateIDFilter(email).
-		OrderDesc().
-		SetLimit(1)
-}
-
 func UserAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, user *model.User) (*es_models.Aggregate, error) {
 	if user == nil {
 		return nil, errors.ThrowPreconditionFailed(nil, "EVENT-dis83", "Errors.Internal")
@ -111,11 +103,7 @@ func UserCreateAggregate(ctx context.Context, aggCreator *es_models.AggregateCre
 	if err != nil {
 		return nil, err
 	}
-	return []*es_models.Aggregate{
-		agg,
-		uniqueAggregates[0],
-		uniqueAggregates[1],
-	}, nil
+	return append(uniqueAggregates, agg), nil
 }

 func UserRegisterAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, user *model.User, resourceOwner string, initCode *model.InitUserCode, userLoginMustBeDomain bool) ([]*es_models.Aggregate, error) {
@ -148,11 +136,7 @@ func UserRegisterAggregate(ctx context.Context, aggCreator *es_models.AggregateC
 	if err != nil {
 		return nil, err
 	}
-	return []*es_models.Aggregate{
-		agg,
-		uniqueAggregates[0],
-		uniqueAggregates[1],
-	}, nil
+	return append(uniqueAggregates, agg), nil
 }

 func getUniqueUserAggregates(ctx context.Context, aggCreator *es_models.AggregateCreator, user *model.User, resourceOwner string, userLoginMustBeDomain bool) ([]*es_models.Aggregate, error) {
@ -161,13 +145,8 @@ func getUniqueUserAggregates(ctx context.Context, aggCreator *es_models.Aggregat
 		return nil, err
 	}

-	emailAggregate, err := reservedUniqueEmailAggregate(ctx, aggCreator, resourceOwner, user.EmailAddress)
-	if err != nil {
-		return nil, err
-	}
 	return []*es_models.Aggregate{
 		userNameAggregate,
-		emailAggregate,
 	}, nil
 }
 func reservedUniqueUserNameAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, resourceOwner, userName string, userLoginMustBeDomain bool) (*es_models.Aggregate, error) {
@ -206,36 +185,18 @@ func releasedUniqueUserNameAggregate(ctx context.Context, aggCreator *es_models.
 	return aggregate.SetPrecondition(UserUserNameUniqueQuery(username), isEventValidation(aggregate, model.UserUserNameReleased)), nil
 }

-func reservedUniqueEmailAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, resourceOwner, email string) (aggregate *es_models.Aggregate, err error) {
-	aggregate, err = aggCreator.NewAggregate(ctx, email, model.UserEmailAggregate, model.UserVersion, 0)
-	if resourceOwner != "" {
-		aggregate, err = aggCreator.NewAggregate(ctx, email, model.UserEmailAggregate, model.UserVersion, 0, es_models.OverwriteResourceOwner(resourceOwner))
-	}
+func changeUniqueUserNameAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, resourceOwner, oldUsername, username string, userLoginMustBeDomain bool) ([]*es_models.Aggregate, error) {
+	aggregates := make([]*es_models.Aggregate, 2)
+	var err error
+	aggregates[0], err = releasedUniqueUserNameAggregate(ctx, aggCreator, resourceOwner, oldUsername)
 	if err != nil {
 		return nil, err
 	}
-	aggregate, err = aggregate.AppendEvent(model.UserEmailReserved, nil)
+	aggregates[1], err = reservedUniqueUserNameAggregate(ctx, aggCreator, resourceOwner, username, userLoginMustBeDomain)
 	if err != nil {
 		return nil, err
 	}
-
-	return aggregate.SetPrecondition(UserEmailUniqueQuery(email), isEventValidation(aggregate, model.UserEmailReserved)), nil
-}
-
-func releasedUniqueEmailAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, resourceOwner, email string) (aggregate *es_models.Aggregate, err error) {
-	aggregate, err = aggCreator.NewAggregate(ctx, email, model.UserEmailAggregate, model.UserVersion, 0)
-	if resourceOwner != "" {
-		aggregate, err = aggCreator.NewAggregate(ctx, email, model.UserEmailAggregate, model.UserVersion, 0, es_models.OverwriteResourceOwner(resourceOwner))
-	}
-	if err != nil {
-		return nil, err
-	}
-	aggregate, err = aggregate.AppendEvent(model.UserEmailReleased, nil)
-	if err != nil {
-		return nil, err
-	}
-
-	return aggregate.SetPrecondition(UserEmailUniqueQuery(email), isEventValidation(aggregate, model.UserEmailReleased)), nil
+	return aggregates, nil
 }

 func UserDeactivateAggregate(aggCreator *es_models.AggregateCreator, user *model.User) func(ctx context.Context) (*es_models.Aggregate, error) {
@ -401,7 +362,7 @@ func ProfileChangeAggregate(aggCreator *es_models.AggregateCreator, existing *mo
 	}
 }

-func EmailChangeAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, existing *model.User, email *model.Email, code *model.EmailCode) ([]*es_models.Aggregate, error) {
+func EmailChangeAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, existing *model.User, email *model.Email, code *model.EmailCode) (*es_models.Aggregate, error) {
 	if email == nil {
 		return nil, errors.ThrowPreconditionFailed(nil, "EVENT-dki8s", "Errors.Internal")
 	}
@ -412,17 +373,6 @@ func EmailChangeAggregate(ctx context.Context, aggCreator *es_models.AggregateCr
 	if len(changes) == 0 {
 		return nil, errors.ThrowPreconditionFailed(nil, "EVENT-s90pw", "Errors.NoChangesFound")
 	}
-	aggregates := make([]*es_models.Aggregate, 0, 4)
-	reserveEmailAggregate, err := reservedUniqueEmailAggregate(ctx, aggCreator, "", email.EmailAddress)
-	if err != nil {
-		return nil, err
-	}
-	aggregates = append(aggregates, reserveEmailAggregate)
-	releaseEmailAggregate, err := releasedUniqueEmailAggregate(ctx, aggCreator, "", existing.EmailAddress)
-	if err != nil {
-		return nil, err
-	}
-	aggregates = append(aggregates, releaseEmailAggregate)
 	agg, err := UserAggregate(ctx, aggCreator, existing)
 	if err != nil {
 		return nil, err
@ -446,7 +396,7 @@ func EmailChangeAggregate(ctx context.Context, aggCreator *es_models.AggregateCr
 			return nil, err
 		}
 	}
-	return append(aggregates, agg), nil
+	return agg, nil
 }

 func EmailVerifiedAggregate(aggCreator *es_models.AggregateCreator, existing *model.User) es_sdk.AggregateFunc {
@ -673,7 +623,10 @@ func SignOutAggregates(aggCreator *es_models.AggregateCreator, existingUsers []*
 }

 func DomainClaimedAggregate(ctx context.Context, aggCreator *es_models.AggregateCreator, existingUser *model.User, tempName string) ([]*es_models.Aggregate, error) {
-	aggregates := make([]*es_models.Aggregate, 3)
+	aggregates, err := changeUniqueUserNameAggregate(ctx, aggCreator, existingUser.ResourceOwner, existingUser.UserName, tempName, false)
+	if err != nil {
+		return nil, err
+	}
 	userAggregate, err := UserAggregateOverwriteContext(ctx, aggCreator, existingUser, existingUser.ResourceOwner, existingUser.AggregateID)
 	if err != nil {
 		return nil, err
@ -682,18 +635,41 @@ func DomainClaimedAggregate(ctx context.Context, aggCreator *es_models.Aggregate
 	if err != nil {
 		return nil, err
 	}
-	aggregates[0] = userAggregate
-	releasedUniqueAggregate, err := releasedUniqueUserNameAggregate(ctx, aggCreator, existingUser.ResourceOwner, existingUser.UserName)
+	return append(aggregates, userAggregate), nil
+}
+
+func DomainClaimedSentAggregate(aggCreator *es_models.AggregateCreator, user *model.User) func(ctx context.Context) (*es_models.Aggregate, error) {
+	return func(ctx context.Context) (*es_models.Aggregate, error) {
+		agg, err := UserAggregate(ctx, aggCreator, user)
+		if err != nil {
+			return nil, err
+		}
+		return agg.AppendEvent(model.DomainClaimedSent, nil)
+	}
+}
+
+func UsernameChangedAggregates(ctx context.Context, aggCreator *es_models.AggregateCreator, user *model.User, oldUsername string, userLoginMustBeDomain bool) ([]*es_models.Aggregate, error) {
+	aggregates, err := changeUniqueUserNameAggregate(ctx, aggCreator, user.ResourceOwner, oldUsername, user.UserName, userLoginMustBeDomain)
 	if err != nil {
 		return nil, err
 	}
-	aggregates[1] = releasedUniqueAggregate
-	reservedUniqueAggregate, err := reservedUniqueUserNameAggregate(ctx, aggCreator, existingUser.ResourceOwner, tempName, false)
+	userAggregate, err := UserAggregate(ctx, aggCreator, user)
 	if err != nil {
 		return nil, err
 	}
-	aggregates[2] = reservedUniqueAggregate
-	return aggregates, nil
+	userAggregate, err = userAggregate.AppendEvent(model.UserUserNameChanged, map[string]interface{}{"userName": user.UserName})
+	if err != nil {
+		return nil, err
+	}
+	if !userLoginMustBeDomain {
+		validationQuery := es_models.NewSearchQuery().
+			AggregateTypeFilter(org_es_model.OrgAggregate).
+			AggregateIDsFilter()
+
+		validation := addUserNameValidation(user.UserName)
+		userAggregate.SetPrecondition(validationQuery, validation)
+	}
+	return append(aggregates, userAggregate), nil
 }

 func isEventValidation(aggregate *es_models.Aggregate, eventType es_models.EventType) func(...*es_models.Event) error {
--- a/internal/user/repository/eventsourcing/user_test.go
+++ b/internal/user/repository/eventsourcing/user_test.go
@ -136,7 +136,7 @@ func TestUserCreateAggregate(t *testing.T) {
 				eventLen:      1,
 				eventTypes:    []models.EventType{model.UserAdded},
 				checkData:     []bool{true},
-				aggregatesLen: 3,
+				aggregatesLen: 2,
 			},
 		},
 		{
@ -166,7 +166,7 @@ func TestUserCreateAggregate(t *testing.T) {
 				eventLen:      2,
 				eventTypes:    []models.EventType{model.UserAdded, model.InitializedUserCodeAdded},
 				checkData:     []bool{true, true},
-				aggregatesLen: 3,
+				aggregatesLen: 2,
 			},
 		},
 		{
@ -184,7 +184,7 @@ func TestUserCreateAggregate(t *testing.T) {
 				eventLen:      2,
 				eventTypes:    []models.EventType{model.UserAdded, model.UserPhoneCodeAdded},
 				checkData:     []bool{true, true},
-				aggregatesLen: 3,
+				aggregatesLen: 2,
 			},
 		},
 		{
@ -201,7 +201,7 @@ func TestUserCreateAggregate(t *testing.T) {
 				eventLen:      2,
 				eventTypes:    []models.EventType{model.UserAdded, model.UserEmailVerified},
 				checkData:     []bool{true, false},
-				aggregatesLen: 3,
+				aggregatesLen: 2,
 			},
 		},
 		{
@ -219,7 +219,7 @@ func TestUserCreateAggregate(t *testing.T) {
 				eventLen:      2,
 				eventTypes:    []models.EventType{model.UserAdded, model.UserPhoneVerified},
 				checkData:     []bool{true, false},
-				aggregatesLen: 3,
+				aggregatesLen: 2,
 			},
 		},
 	}
@ -231,17 +231,17 @@ func TestUserCreateAggregate(t *testing.T) {
 				t.Errorf("got wrong event len: expected: %v, actual: %v ", tt.res.aggregatesLen, len(aggregates))
 			}

-			if !tt.res.wantErr && len(aggregates[0].Events) != tt.res.eventLen {
-				t.Errorf("got wrong event len: expected: %v, actual: %v ", tt.res.eventLen, len(aggregates[0].Events))
+			if !tt.res.wantErr && len(aggregates[1].Events) != tt.res.eventLen {
+				t.Errorf("got wrong event len: expected: %v, actual: %v ", tt.res.eventLen, len(aggregates[1].Events))
 			}
 			for i := 0; i < tt.res.eventLen; i++ {
-				if !tt.res.wantErr && aggregates[0].Events[i].Type != tt.res.eventTypes[i] {
-					t.Errorf("got wrong event type: expected: %v, actual: %v ", tt.res.eventTypes[i], aggregates[0].Events[i].Type.String())
+				if !tt.res.wantErr && aggregates[1].Events[i].Type != tt.res.eventTypes[i] {
+					t.Errorf("got wrong event type: expected: %v, actual: %v ", tt.res.eventTypes[i], aggregates[1].Events[i].Type.String())
 				}
-				if !tt.res.wantErr && tt.res.checkData[i] && aggregates[0].Events[i].Data == nil {
+				if !tt.res.wantErr && tt.res.checkData[i] && aggregates[1].Events[i].Data == nil {
 					t.Errorf("should have data in event")
 				}
-				if !tt.res.wantErr && !tt.res.checkData[i] && aggregates[0].Events[i].Data != nil {
+				if !tt.res.wantErr && !tt.res.checkData[i] && aggregates[1].Events[i].Data != nil {
 					t.Errorf("should not have data in event")
 				}
 			}
@ -352,14 +352,14 @@ func TestUserRegisterAggregate(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			aggregates, err := UserRegisterAggregate(tt.args.ctx, tt.args.aggCreator, tt.args.new, tt.args.resourceOwner, tt.args.initCode, false)

-			if tt.res.errFunc == nil && len(aggregates[0].Events) != tt.res.eventLen {
-				t.Errorf("got wrong event len: expected: %v, actual: %v ", tt.res.eventLen, len(aggregates[0].Events))
+			if tt.res.errFunc == nil && len(aggregates[1].Events) != tt.res.eventLen {
+				t.Errorf("got wrong event len: expected: %v, actual: %v ", tt.res.eventLen, len(aggregates[1].Events))
 			}
 			for i := 0; i < tt.res.eventLen; i++ {
-				if tt.res.errFunc == nil && aggregates[0].Events[i].Type != tt.res.eventTypes[i] {
-					t.Errorf("got wrong event type: expected: %v, actual: %v ", tt.res.eventTypes[i], aggregates[0].Events[i].Type.String())
+				if tt.res.errFunc == nil && aggregates[1].Events[i].Type != tt.res.eventTypes[i] {
+					t.Errorf("got wrong event type: expected: %v, actual: %v ", tt.res.eventTypes[i], aggregates[1].Events[i].Type.String())
 				}
-				if tt.res.errFunc == nil && aggregates[0].Events[i].Data == nil {
+				if tt.res.errFunc == nil && aggregates[1].Events[i].Data == nil {
 					t.Errorf("should have data in event")
 				}
 			}
@ -1226,16 +1226,16 @@ func TestChangeEmailAggregate(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			aggregates, err := EmailChangeAggregate(tt.args.ctx, tt.args.aggCreator, tt.args.existing, tt.args.email, tt.args.code)
+			aggregate, err := EmailChangeAggregate(tt.args.ctx, tt.args.aggCreator, tt.args.existing, tt.args.email, tt.args.code)

-			if tt.res.errFunc == nil && len(aggregates[2].Events) != tt.res.eventLen {
-				t.Errorf("got wrong event len: expected: %v, actual: %v ", tt.res.eventLen, len(aggregates[1].Events))
+			if tt.res.errFunc == nil && len(aggregate.Events) != tt.res.eventLen {
+				t.Errorf("got wrong event len: expected: %v, actual: %v ", tt.res.eventLen, len(aggregate.Events))
 			}
 			for i := 0; i < tt.res.eventLen; i++ {
-				if tt.res.errFunc == nil && aggregates[2].Events[i].Type != tt.res.eventTypes[i] {
-					t.Errorf("got wrong event type: expected: %v, actual: %v ", tt.res.eventTypes[i], aggregates[1].Events[i].Type.String())
+				if tt.res.errFunc == nil && aggregate.Events[i].Type != tt.res.eventTypes[i] {
+					t.Errorf("got wrong event type: expected: %v, actual: %v ", tt.res.eventTypes[i], aggregate.Events[i].Type.String())
 				}
-				if tt.res.errFunc == nil && aggregates[2].Events[i].Data == nil {
+				if tt.res.errFunc == nil && aggregate.Events[i].Data == nil {
 					t.Errorf("should have data in event")
 				}
 			}
--- a/internal/user/repository/view/model/user.go
+++ b/internal/user/repository/view/model/user.go
@ -36,6 +36,7 @@ type UserView struct {
 	State                  int32          `json:"-" gorm:"column:user_state"`
 	PasswordSet            bool           `json:"-" gorm:"column:password_set"`
 	PasswordChangeRequired bool           `json:"-" gorm:"column:password_change_required"`
+	UsernameChangeRequired bool           `json:"-" gorm:"column:username_change_required"`
 	PasswordChanged        time.Time      `json:"-" gorm:"column:password_change"`
 	LastLogin              time.Time      `json:"-" gorm:"column:last_login"`
 	UserName               string         `json:"userName" gorm:"column:user_name"`
@ -72,6 +73,7 @@ func UserFromModel(user *model.UserView) *UserView {
 		State:                  int32(user.State),
 		PasswordSet:            user.PasswordSet,
 		PasswordChangeRequired: user.PasswordChangeRequired,
+		UsernameChangeRequired: user.UsernameChangeRequired,
 		PasswordChanged:        user.PasswordChanged,
 		LastLogin:              user.LastLogin,
 		UserName:               user.UserName,
@ -109,6 +111,7 @@ func UserToModel(user *UserView) *model.UserView {
 		State:                  model.UserState(user.State),
 		PasswordSet:            user.PasswordSet,
 		PasswordChangeRequired: user.PasswordChangeRequired,
+		UsernameChangeRequired: user.UsernameChangeRequired,
 		PasswordChanged:        user.PasswordChanged,
 		LastLogin:              user.LastLogin,
 		PreferredLoginName:     user.PreferredLoginName,
@ -181,8 +184,13 @@ func (u *UserView) AppendEvent(event *models.Event) (err error) {
 	case es_model.UserPasswordChanged:
 		err = u.setPasswordData(event)
 	case es_model.UserProfileChanged,
-		es_model.UserAddressChanged,
-		es_model.DomainClaimed:
+		es_model.UserAddressChanged:
+		err = u.setData(event)
+	case es_model.DomainClaimed:
+		u.UsernameChangeRequired = true
+		err = u.setData(event)
+	case es_model.UserUserNameChanged:
+		u.UsernameChangeRequired = false
 		err = u.setData(event)
 	case es_model.UserEmailChanged:
 		u.IsEmailVerified = false
--- a/internal/user/repository/view/user_view.go
+++ b/internal/user/repository/view/user_view.go
@ -94,9 +94,9 @@ func SearchUsers(db *gorm.DB, table string, req *usr_model.UserSearchRequest) ([
 	return users, count, nil
 }

-func GetGlobalUserByEmail(db *gorm.DB, table, email string) (*model.UserView, error) {
+func GetGlobalUserByLoginName(db *gorm.DB, table, loginName string) (*model.UserView, error) {
 	user := new(model.UserView)
-	query := repository.PrepareGetByKey(table, model.UserSearchKey(usr_model.UserSearchKeyEmail), email)
+	query := repository.PrepareGetByQuery(table, &model.UserSearchQuery{Key: usr_model.UserSearchKeyLoginNames, Value: loginName, Method: global_model.SearchMethodListContains})
 	err := query(db, user)
 	if caos_errs.IsNotFound(err) {
 		return nil, caos_errs.ThrowNotFound(nil, "VIEW-8uWer", "Errors.User.NotFound")
--- a/migrations/cockroach/V1.7__username_change.sql
+++ b/migrations/cockroach/V1.7__username_change.sql
@ -0,0 +1,7 @@
+BEGIN;
+
+ALTER TABLE management.users ADD COLUMN username_change_required BOOLEAN;
+ALTER TABLE auth.users ADD COLUMN username_change_required BOOLEAN;
+ALTER TABLE adminapi.users ADD COLUMN username_change_required BOOLEAN;
+
+COMMIT;
--- a/pkg/grpc/auth/auth.pb.authoptions.go
+++ b/pkg/grpc/auth/auth.pb.authoptions.go
@ -34,6 +34,11 @@ var AuthService_AuthMethods = authz.MethodMapping{
 		CheckParam: "",
 	},

+	"/caos.zitadel.auth.api.v1.AuthService/ChangeMyUserName": authz.Option{
+		Permission: "authenticated",
+		CheckParam: "",
+	},
+
 	"/caos.zitadel.auth.api.v1.AuthService/GetMyUserEmail": authz.Option{
 		Permission: "authenticated",
 		CheckParam: "",
--- a/pkg/grpc/auth/auth.pb.go
+++ b/pkg/grpc/auth/auth.pb.go
@ -1006,6 +1006,45 @@ func (m *UpdateUserProfileRequest) GetGender() Gender {
 	return Gender_GENDER_UNSPECIFIED
 }

+type ChangeUserNameRequest struct {
+	UserName             string   `protobuf:"bytes,1,opt,name=user_name,json=userName,proto3" json:"user_name,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ChangeUserNameRequest) Reset()         { *m = ChangeUserNameRequest{} }
+func (m *ChangeUserNameRequest) String() string { return proto.CompactTextString(m) }
+func (*ChangeUserNameRequest) ProtoMessage()    {}
+func (*ChangeUserNameRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_8bbd6f3875b0e874, []int{6}
+}
+
+func (m *ChangeUserNameRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ChangeUserNameRequest.Unmarshal(m, b)
+}
+func (m *ChangeUserNameRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ChangeUserNameRequest.Marshal(b, m, deterministic)
+}
+func (m *ChangeUserNameRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ChangeUserNameRequest.Merge(m, src)
+}
+func (m *ChangeUserNameRequest) XXX_Size() int {
+	return xxx_messageInfo_ChangeUserNameRequest.Size(m)
+}
+func (m *ChangeUserNameRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_ChangeUserNameRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ChangeUserNameRequest proto.InternalMessageInfo
+
+func (m *ChangeUserNameRequest) GetUserName() string {
+	if m != nil {
+		return m.UserName
+	}
+	return ""
+}
+
 type UserEmail struct {
 	Id                   string               `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
 	Email                string               `protobuf:"bytes,2,opt,name=email,proto3" json:"email,omitempty"`
@ -1022,7 +1061,7 @@ func (m *UserEmail) Reset()         { *m = UserEmail{} }
 func (m *UserEmail) String() string { return proto.CompactTextString(m) }
 func (*UserEmail) ProtoMessage()    {}
 func (*UserEmail) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{6}
+	return fileDescriptor_8bbd6f3875b0e874, []int{7}
 }

 func (m *UserEmail) XXX_Unmarshal(b []byte) error {
@ -1101,7 +1140,7 @@ func (m *UserEmailView) Reset()         { *m = UserEmailView{} }
 func (m *UserEmailView) String() string { return proto.CompactTextString(m) }
 func (*UserEmailView) ProtoMessage()    {}
 func (*UserEmailView) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{7}
+	return fileDescriptor_8bbd6f3875b0e874, []int{8}
 }

 func (m *UserEmailView) XXX_Unmarshal(b []byte) error {
@ -1175,7 +1214,7 @@ func (m *VerifyMyUserEmailRequest) Reset()         { *m = VerifyMyUserEmailReque
 func (m *VerifyMyUserEmailRequest) String() string { return proto.CompactTextString(m) }
 func (*VerifyMyUserEmailRequest) ProtoMessage()    {}
 func (*VerifyMyUserEmailRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{8}
+	return fileDescriptor_8bbd6f3875b0e874, []int{9}
 }

 func (m *VerifyMyUserEmailRequest) XXX_Unmarshal(b []byte) error {
@ -1215,7 +1254,7 @@ func (m *VerifyUserEmailRequest) Reset()         { *m = VerifyUserEmailRequest{}
 func (m *VerifyUserEmailRequest) String() string { return proto.CompactTextString(m) }
 func (*VerifyUserEmailRequest) ProtoMessage()    {}
 func (*VerifyUserEmailRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{9}
+	return fileDescriptor_8bbd6f3875b0e874, []int{10}
 }

 func (m *VerifyUserEmailRequest) XXX_Unmarshal(b []byte) error {
@ -1261,7 +1300,7 @@ func (m *UpdateUserEmailRequest) Reset()         { *m = UpdateUserEmailRequest{}
 func (m *UpdateUserEmailRequest) String() string { return proto.CompactTextString(m) }
 func (*UpdateUserEmailRequest) ProtoMessage()    {}
 func (*UpdateUserEmailRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{10}
+	return fileDescriptor_8bbd6f3875b0e874, []int{11}
 }

 func (m *UpdateUserEmailRequest) XXX_Unmarshal(b []byte) error {
@ -1305,7 +1344,7 @@ func (m *UserPhone) Reset()         { *m = UserPhone{} }
 func (m *UserPhone) String() string { return proto.CompactTextString(m) }
 func (*UserPhone) ProtoMessage()    {}
 func (*UserPhone) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{11}
+	return fileDescriptor_8bbd6f3875b0e874, []int{12}
 }

 func (m *UserPhone) XXX_Unmarshal(b []byte) error {
@ -1384,7 +1423,7 @@ func (m *UserPhoneView) Reset()         { *m = UserPhoneView{} }
 func (m *UserPhoneView) String() string { return proto.CompactTextString(m) }
 func (*UserPhoneView) ProtoMessage()    {}
 func (*UserPhoneView) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{12}
+	return fileDescriptor_8bbd6f3875b0e874, []int{13}
 }

 func (m *UserPhoneView) XXX_Unmarshal(b []byte) error {
@ -1458,7 +1497,7 @@ func (m *UpdateUserPhoneRequest) Reset()         { *m = UpdateUserPhoneRequest{}
 func (m *UpdateUserPhoneRequest) String() string { return proto.CompactTextString(m) }
 func (*UpdateUserPhoneRequest) ProtoMessage()    {}
 func (*UpdateUserPhoneRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{13}
+	return fileDescriptor_8bbd6f3875b0e874, []int{14}
 }

 func (m *UpdateUserPhoneRequest) XXX_Unmarshal(b []byte) error {
@ -1497,7 +1536,7 @@ func (m *VerifyUserPhoneRequest) Reset()         { *m = VerifyUserPhoneRequest{}
 func (m *VerifyUserPhoneRequest) String() string { return proto.CompactTextString(m) }
 func (*VerifyUserPhoneRequest) ProtoMessage()    {}
 func (*VerifyUserPhoneRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{14}
+	return fileDescriptor_8bbd6f3875b0e874, []int{15}
 }

 func (m *VerifyUserPhoneRequest) XXX_Unmarshal(b []byte) error {
@ -1544,7 +1583,7 @@ func (m *UserAddress) Reset()         { *m = UserAddress{} }
 func (m *UserAddress) String() string { return proto.CompactTextString(m) }
 func (*UserAddress) ProtoMessage()    {}
 func (*UserAddress) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{15}
+	return fileDescriptor_8bbd6f3875b0e874, []int{16}
 }

 func (m *UserAddress) XXX_Unmarshal(b []byte) error {
@ -1647,7 +1686,7 @@ func (m *UserAddressView) Reset()         { *m = UserAddressView{} }
 func (m *UserAddressView) String() string { return proto.CompactTextString(m) }
 func (*UserAddressView) ProtoMessage()    {}
 func (*UserAddressView) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{16}
+	return fileDescriptor_8bbd6f3875b0e874, []int{17}
 }

 func (m *UserAddressView) XXX_Unmarshal(b []byte) error {
@ -1746,7 +1785,7 @@ func (m *UpdateUserAddressRequest) Reset()         { *m = UpdateUserAddressReque
 func (m *UpdateUserAddressRequest) String() string { return proto.CompactTextString(m) }
 func (*UpdateUserAddressRequest) ProtoMessage()    {}
 func (*UpdateUserAddressRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{17}
+	return fileDescriptor_8bbd6f3875b0e874, []int{18}
 }

 func (m *UpdateUserAddressRequest) XXX_Unmarshal(b []byte) error {
@ -1813,7 +1852,7 @@ func (m *PasswordID) Reset()         { *m = PasswordID{} }
 func (m *PasswordID) String() string { return proto.CompactTextString(m) }
 func (*PasswordID) ProtoMessage()    {}
 func (*PasswordID) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{18}
+	return fileDescriptor_8bbd6f3875b0e874, []int{19}
 }

 func (m *PasswordID) XXX_Unmarshal(b []byte) error {
@ -1852,7 +1891,7 @@ func (m *PasswordRequest) Reset()         { *m = PasswordRequest{} }
 func (m *PasswordRequest) String() string { return proto.CompactTextString(m) }
 func (*PasswordRequest) ProtoMessage()    {}
 func (*PasswordRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{19}
+	return fileDescriptor_8bbd6f3875b0e874, []int{20}
 }

 func (m *PasswordRequest) XXX_Unmarshal(b []byte) error {
@ -1892,7 +1931,7 @@ func (m *PasswordChange) Reset()         { *m = PasswordChange{} }
 func (m *PasswordChange) String() string { return proto.CompactTextString(m) }
 func (*PasswordChange) ProtoMessage()    {}
 func (*PasswordChange) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{20}
+	return fileDescriptor_8bbd6f3875b0e874, []int{21}
 }

 func (m *PasswordChange) XXX_Unmarshal(b []byte) error {
@ -1938,7 +1977,7 @@ func (m *VerifyMfaOtp) Reset()         { *m = VerifyMfaOtp{} }
 func (m *VerifyMfaOtp) String() string { return proto.CompactTextString(m) }
 func (*VerifyMfaOtp) ProtoMessage()    {}
 func (*VerifyMfaOtp) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{21}
+	return fileDescriptor_8bbd6f3875b0e874, []int{22}
 }

 func (m *VerifyMfaOtp) XXX_Unmarshal(b []byte) error {
@ -1977,7 +2016,7 @@ func (m *MultiFactors) Reset()         { *m = MultiFactors{} }
 func (m *MultiFactors) String() string { return proto.CompactTextString(m) }
 func (*MultiFactors) ProtoMessage()    {}
 func (*MultiFactors) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{22}
+	return fileDescriptor_8bbd6f3875b0e874, []int{23}
 }

 func (m *MultiFactors) XXX_Unmarshal(b []byte) error {
@ -2017,7 +2056,7 @@ func (m *MultiFactor) Reset()         { *m = MultiFactor{} }
 func (m *MultiFactor) String() string { return proto.CompactTextString(m) }
 func (*MultiFactor) ProtoMessage()    {}
 func (*MultiFactor) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{23}
+	return fileDescriptor_8bbd6f3875b0e874, []int{24}
 }

 func (m *MultiFactor) XXX_Unmarshal(b []byte) error {
@ -2066,7 +2105,7 @@ func (m *MfaOtpResponse) Reset()         { *m = MfaOtpResponse{} }
 func (m *MfaOtpResponse) String() string { return proto.CompactTextString(m) }
 func (*MfaOtpResponse) ProtoMessage()    {}
 func (*MfaOtpResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{24}
+	return fileDescriptor_8bbd6f3875b0e874, []int{25}
 }

 func (m *MfaOtpResponse) XXX_Unmarshal(b []byte) error {
@ -2127,7 +2166,7 @@ func (m *OIDCClientAuth) Reset()         { *m = OIDCClientAuth{} }
 func (m *OIDCClientAuth) String() string { return proto.CompactTextString(m) }
 func (*OIDCClientAuth) ProtoMessage()    {}
 func (*OIDCClientAuth) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{25}
+	return fileDescriptor_8bbd6f3875b0e874, []int{26}
 }

 func (m *OIDCClientAuth) XXX_Unmarshal(b []byte) error {
@ -2177,7 +2216,7 @@ func (m *UserGrantSearchRequest) Reset()         { *m = UserGrantSearchRequest{}
 func (m *UserGrantSearchRequest) String() string { return proto.CompactTextString(m) }
 func (*UserGrantSearchRequest) ProtoMessage()    {}
 func (*UserGrantSearchRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{26}
+	return fileDescriptor_8bbd6f3875b0e874, []int{27}
 }

 func (m *UserGrantSearchRequest) XXX_Unmarshal(b []byte) error {
@ -2246,7 +2285,7 @@ func (m *UserGrantSearchQuery) Reset()         { *m = UserGrantSearchQuery{} }
 func (m *UserGrantSearchQuery) String() string { return proto.CompactTextString(m) }
 func (*UserGrantSearchQuery) ProtoMessage()    {}
 func (*UserGrantSearchQuery) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{27}
+	return fileDescriptor_8bbd6f3875b0e874, []int{28}
 }

 func (m *UserGrantSearchQuery) XXX_Unmarshal(b []byte) error {
@ -2304,7 +2343,7 @@ func (m *UserGrantSearchResponse) Reset()         { *m = UserGrantSearchResponse
 func (m *UserGrantSearchResponse) String() string { return proto.CompactTextString(m) }
 func (*UserGrantSearchResponse) ProtoMessage()    {}
 func (*UserGrantSearchResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{28}
+	return fileDescriptor_8bbd6f3875b0e874, []int{29}
 }

 func (m *UserGrantSearchResponse) XXX_Unmarshal(b []byte) error {
@ -2383,7 +2422,7 @@ func (m *UserGrantView) Reset()         { *m = UserGrantView{} }
 func (m *UserGrantView) String() string { return proto.CompactTextString(m) }
 func (*UserGrantView) ProtoMessage()    {}
 func (*UserGrantView) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{29}
+	return fileDescriptor_8bbd6f3875b0e874, []int{30}
 }

 func (m *UserGrantView) XXX_Unmarshal(b []byte) error {
@ -2460,7 +2499,7 @@ func (m *MyProjectOrgSearchRequest) Reset()         { *m = MyProjectOrgSearchReq
 func (m *MyProjectOrgSearchRequest) String() string { return proto.CompactTextString(m) }
 func (*MyProjectOrgSearchRequest) ProtoMessage()    {}
 func (*MyProjectOrgSearchRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{30}
+	return fileDescriptor_8bbd6f3875b0e874, []int{31}
 }

 func (m *MyProjectOrgSearchRequest) XXX_Unmarshal(b []byte) error {
@ -2522,7 +2561,7 @@ func (m *MyProjectOrgSearchQuery) Reset()         { *m = MyProjectOrgSearchQuery
 func (m *MyProjectOrgSearchQuery) String() string { return proto.CompactTextString(m) }
 func (*MyProjectOrgSearchQuery) ProtoMessage()    {}
 func (*MyProjectOrgSearchQuery) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{31}
+	return fileDescriptor_8bbd6f3875b0e874, []int{32}
 }

 func (m *MyProjectOrgSearchQuery) XXX_Unmarshal(b []byte) error {
@ -2578,7 +2617,7 @@ func (m *MyProjectOrgSearchResponse) Reset()         { *m = MyProjectOrgSearchRe
 func (m *MyProjectOrgSearchResponse) String() string { return proto.CompactTextString(m) }
 func (*MyProjectOrgSearchResponse) ProtoMessage()    {}
 func (*MyProjectOrgSearchResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{32}
+	return fileDescriptor_8bbd6f3875b0e874, []int{33}
 }

 func (m *MyProjectOrgSearchResponse) XXX_Unmarshal(b []byte) error {
@ -2639,7 +2678,7 @@ func (m *Org) Reset()         { *m = Org{} }
 func (m *Org) String() string { return proto.CompactTextString(m) }
 func (*Org) ProtoMessage()    {}
 func (*Org) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{33}
+	return fileDescriptor_8bbd6f3875b0e874, []int{34}
 }

 func (m *Org) XXX_Unmarshal(b []byte) error {
@ -2685,7 +2724,7 @@ func (m *MyPermissions) Reset()         { *m = MyPermissions{} }
 func (m *MyPermissions) String() string { return proto.CompactTextString(m) }
 func (*MyPermissions) ProtoMessage()    {}
 func (*MyPermissions) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{34}
+	return fileDescriptor_8bbd6f3875b0e874, []int{35}
 }

 func (m *MyPermissions) XXX_Unmarshal(b []byte) error {
@ -2726,7 +2765,7 @@ func (m *ChangesRequest) Reset()         { *m = ChangesRequest{} }
 func (m *ChangesRequest) String() string { return proto.CompactTextString(m) }
 func (*ChangesRequest) ProtoMessage()    {}
 func (*ChangesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{35}
+	return fileDescriptor_8bbd6f3875b0e874, []int{36}
 }

 func (m *ChangesRequest) XXX_Unmarshal(b []byte) error {
@ -2781,7 +2820,7 @@ func (m *Changes) Reset()         { *m = Changes{} }
 func (m *Changes) String() string { return proto.CompactTextString(m) }
 func (*Changes) ProtoMessage()    {}
 func (*Changes) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{36}
+	return fileDescriptor_8bbd6f3875b0e874, []int{37}
 }

 func (m *Changes) XXX_Unmarshal(b []byte) error {
@ -2839,7 +2878,7 @@ func (m *Change) Reset()         { *m = Change{} }
 func (m *Change) String() string { return proto.CompactTextString(m) }
 func (*Change) ProtoMessage()    {}
 func (*Change) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{37}
+	return fileDescriptor_8bbd6f3875b0e874, []int{38}
 }

 func (m *Change) XXX_Unmarshal(b []byte) error {
@ -2923,7 +2962,7 @@ func (m *PasswordComplexityPolicy) Reset()         { *m = PasswordComplexityPoli
 func (m *PasswordComplexityPolicy) String() string { return proto.CompactTextString(m) }
 func (*PasswordComplexityPolicy) ProtoMessage()    {}
 func (*PasswordComplexityPolicy) Descriptor() ([]byte, []int) {
-	return fileDescriptor_8bbd6f3875b0e874, []int{38}
+	return fileDescriptor_8bbd6f3875b0e874, []int{39}
 }

 func (m *PasswordComplexityPolicy) XXX_Unmarshal(b []byte) error {
@ -3037,6 +3076,7 @@ func init() {
 	proto.RegisterType((*UserProfile)(nil), "caos.zitadel.auth.api.v1.UserProfile")
 	proto.RegisterType((*UserProfileView)(nil), "caos.zitadel.auth.api.v1.UserProfileView")
 	proto.RegisterType((*UpdateUserProfileRequest)(nil), "caos.zitadel.auth.api.v1.UpdateUserProfileRequest")
+	proto.RegisterType((*ChangeUserNameRequest)(nil), "caos.zitadel.auth.api.v1.ChangeUserNameRequest")
 	proto.RegisterType((*UserEmail)(nil), "caos.zitadel.auth.api.v1.UserEmail")
 	proto.RegisterType((*UserEmailView)(nil), "caos.zitadel.auth.api.v1.UserEmailView")
 	proto.RegisterType((*VerifyMyUserEmailRequest)(nil), "caos.zitadel.auth.api.v1.VerifyMyUserEmailRequest")
@ -3075,239 +3115,242 @@ func init() {
 func init() { proto.RegisterFile("auth.proto", fileDescriptor_8bbd6f3875b0e874) }

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+	0x31, 0x33, 0x5d, 0xa5, 0xa3, 0x6d, 0xb4, 0x69, 0x57, 0xa9, 0xdd, 0xa5, 0x9a, 0xed, 0x2a, 0xe5,
+	0x0e, 0x23, 0x91, 0x3b, 0xe3, 0x35, 0x4e, 0xf9, 0x44, 0x0e, 0x8e, 0xd8, 0xeb, 0x33, 0xf5, 0x7c,
+	0x4c, 0xf1, 0x4e, 0xd0, 0xec, 0x49, 0x94, 0x18, 0xce, 0xde, 0x21, 0x53, 0xfd, 0x85, 0xeb, 0x0a,
+	0x77, 0x7a, 0x59, 0x13, 0x62, 0x35, 0xda, 0x23, 0x0b, 0xcc, 0xe5, 0x47, 0x41, 0x08, 0x32, 0xe9,
+	0x4d, 0x57, 0x2e, 0x73, 0x63, 0x66, 0x8e, 0xff, 0x37, 0x32, 0xf1, 0xc4, 0x3f, 0x0b, 0xb0, 0x45,
+	0x5d, 0x11, 0xf8, 0xe8, 0x12, 0xe4, 0x9e, 0xdd, 0x19, 0x60, 0x7b, 0x6c, 0x4d, 0x00, 0x8a, 0xae,
+	0xe5, 0x7a, 0x44, 0x46, 0xc5, 0xa6, 0x0b, 0x68, 0xcb, 0x31, 0x80, 0x3e, 0x83, 0x58, 0x5e, 0x51,
+	0xca, 0x27, 0x72, 0xb5, 0x51, 0x0b, 0xc4, 0xb4, 0x3d, 0xb1, 0xb9, 0xe6, 0x6a, 0x88, 0x4d, 0x48,
+	0x19, 0x71, 0x65, 0x24, 0x68, 0x39, 0xdd, 0xea, 0x11, 0x47, 0x7d, 0x21, 0xb8, 0x9b, 0x88, 0x8d,
+	0x1a, 0x7a, 0x7d, 0xea, 0x6d, 0x4e, 0x67, 0x0c, 0x0c, 0xda, 0x6f, 0x05, 0x21, 0xb8, 0x96, 0xde,
+	0xf0, 0x21, 0x70, 0x9f, 0x85, 0x1a, 0x2c, 0xf2, 0x3b, 0x61, 0xb2, 0x33, 0x82, 0x26, 0x0e, 0xde,
+	0xce, 0x59, 0xff, 0xd2, 0xd1, 0xbf, 0x09, 0xb0, 0xc2, 0x3f, 0x32, 0x07, 0xce, 0x47, 0xef, 0xc4,
+	0xdb, 0x71, 0x6c, 0x57, 0x2e, 0xfd, 0xe0, 0x02, 0x1a, 0x3c, 0x46, 0x6f, 0x05, 0x01, 0xdd, 0x14,
+	0xd7, 0x28, 0xd0, 0x36, 0x51, 0xa2, 0x68, 0x9b, 0x26, 0x55, 0x25, 0xee, 0xf9, 0x1f, 0x01, 0x2e,
+	0xdb, 0x80, 0x87, 0x1f, 0xe0, 0x26, 0x7a, 0xf3, 0x22, 0x0f, 0xfb, 0x36, 0xea, 0xb7, 0x2e, 0xa6,
+	0xc4, 0x81, 0x07, 0xa7, 0xb9, 0xb8, 0x99, 0x6b, 0x6b, 0xfa, 0xb1, 0xac, 0x91, 0xc2, 0x9e, 0x28,
+	0xeb, 0x46, 0xdb, 0x74, 0xa3, 0xff, 0x73, 0x01, 0xd6, 0xe9, 0x7e, 0xfc, 0x90, 0x4d, 0xe9, 0x7e,
+	0x21, 0x7f, 0x89, 0xaa, 0x68, 0xe4, 0x89, 0x5d, 0xdc, 0x0d, 0xc2, 0xb5, 0x81, 0xd6, 0x73, 0xae,
+	0x97, 0xf6, 0x1c, 0x37, 0x45, 0xbe, 0xcf, 0xfe, 0xd8, 0x06, 0xc4, 0x57, 0xfb, 0x2b, 0x05, 0x34,
+	0xb1, 0x4c, 0x73, 0x03, 0xea, 0xe0, 0x27, 0xff, 0x21, 0x7c, 0x95, 0xff, 0x13, 0x01, 0xbd, 0x03,
+	0xd1, 0x7c, 0xdf, 0x3a, 0xcd, 0xe4, 0x6b, 0x25, 0x31, 0x8b, 0xb6, 0x4f, 0x2d, 0xab, 0x67, 0x3e,
+	0xce, 0xe5, 0xda, 0xaa, 0x75, 0xda, 0x3f, 0xde, 0x69, 0xe9, 0x9d, 0x1c, 0x99, 0xdb, 0x59, 0x41,
+	0xef, 0xe3, 0x76, 0x8e, 0x98, 0xdf, 0x0d, 0xdf, 0xdf, 0x79, 0x90, 0x15, 0x42, 0xbb, 0x49, 0xb9,
+	0xd7, 0xd3, 0xf8, 0x25, 0x9e, 0xfb, 0xc8, 0xd4, 0xbb, 0xa3, 0x94, 0xb6, 0xd1, 0x6b, 0x3d, 0xf6,
+	0xc9, 0x3c, 0xf6, 0xc9, 0x7c, 0x78, 0x6b, 0xd2, 0x8c, 0x44, 0x82, 0x4e, 0x7b, 0x3c, 0x4f, 0x5d,
+	0xf3, 0xe6, 0x2f, 0x03, 0x00, 0x00, 0xff, 0xff, 0xbd, 0x14, 0xb2, 0x4a, 0xb5, 0x35, 0x00, 0x00,
 }

 // Reference imports to suppress errors if they are not otherwise used.
 var _ context.Context
-var _ grpc.ClientConn
+var _ grpc.ClientConnInterface

 // This is a compile-time assertion to ensure that this generated file
 // is compatible with the grpc package it is being compiled against.
-const _ = grpc.SupportPackageIsVersion4
+const _ = grpc.SupportPackageIsVersion6

 // AuthServiceClient is the client API for AuthService service.
 //
@ -3323,6 +3366,7 @@ type AuthServiceClient interface {
 	GetMyUser(ctx context.Context, in *empty.Empty, opts ...grpc.CallOption) (*UserView, error)
 	GetMyUserProfile(ctx context.Context, in *empty.Empty, opts ...grpc.CallOption) (*UserProfileView, error)
 	UpdateMyUserProfile(ctx context.Context, in *UpdateUserProfileRequest, opts ...grpc.CallOption) (*UserProfile, error)
+	ChangeMyUserName(ctx context.Context, in *ChangeUserNameRequest, opts ...grpc.CallOption) (*empty.Empty, error)
 	GetMyUserEmail(ctx context.Context, in *empty.Empty, opts ...grpc.CallOption) (*UserEmailView, error)
 	ChangeMyUserEmail(ctx context.Context, in *UpdateUserEmailRequest, opts ...grpc.CallOption) (*UserEmail, error)
 	VerifyMyUserEmail(ctx context.Context, in *VerifyMyUserEmailRequest, opts ...grpc.CallOption) (*empty.Empty, error)
@ -3351,10 +3395,10 @@ type AuthServiceClient interface {
 }

 type authServiceClient struct {
-	cc *grpc.ClientConn
+	cc grpc.ClientConnInterface
 }

-func NewAuthServiceClient(cc *grpc.ClientConn) AuthServiceClient {
+func NewAuthServiceClient(cc grpc.ClientConnInterface) AuthServiceClient {
 	return &authServiceClient{cc}
 }

@ -3421,6 +3465,15 @@ func (c *authServiceClient) UpdateMyUserProfile(ctx context.Context, in *UpdateU
 	return out, nil
 }

+func (c *authServiceClient) ChangeMyUserName(ctx context.Context, in *ChangeUserNameRequest, opts ...grpc.CallOption) (*empty.Empty, error) {
+	out := new(empty.Empty)
+	err := c.cc.Invoke(ctx, "/caos.zitadel.auth.api.v1.AuthService/ChangeMyUserName", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *authServiceClient) GetMyUserEmail(ctx context.Context, in *empty.Empty, opts ...grpc.CallOption) (*UserEmailView, error) {
 	out := new(UserEmailView)
 	err := c.cc.Invoke(ctx, "/caos.zitadel.auth.api.v1.AuthService/GetMyUserEmail", in, out, opts...)
@ -3631,6 +3684,7 @@ type AuthServiceServer interface {
 	GetMyUser(context.Context, *empty.Empty) (*UserView, error)
 	GetMyUserProfile(context.Context, *empty.Empty) (*UserProfileView, error)
 	UpdateMyUserProfile(context.Context, *UpdateUserProfileRequest) (*UserProfile, error)
+	ChangeMyUserName(context.Context, *ChangeUserNameRequest) (*empty.Empty, error)
 	GetMyUserEmail(context.Context, *empty.Empty) (*UserEmailView, error)
 	ChangeMyUserEmail(context.Context, *UpdateUserEmailRequest) (*UserEmail, error)
 	VerifyMyUserEmail(context.Context, *VerifyMyUserEmailRequest) (*empty.Empty, error)
@ -3683,6 +3737,9 @@ func (*UnimplementedAuthServiceServer) GetMyUserProfile(ctx context.Context, req
 func (*UnimplementedAuthServiceServer) UpdateMyUserProfile(ctx context.Context, req *UpdateUserProfileRequest) (*UserProfile, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method UpdateMyUserProfile not implemented")
 }
+func (*UnimplementedAuthServiceServer) ChangeMyUserName(ctx context.Context, req *ChangeUserNameRequest) (*empty.Empty, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ChangeMyUserName not implemented")
+}
 func (*UnimplementedAuthServiceServer) GetMyUserEmail(ctx context.Context, req *empty.Empty) (*UserEmailView, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method GetMyUserEmail not implemented")
 }
@ -3880,6 +3937,24 @@ func _AuthService_UpdateMyUserProfile_Handler(srv interface{}, ctx context.Conte
 	return interceptor(ctx, in, info, handler)
 }

+func _AuthService_ChangeMyUserName_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ChangeUserNameRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(AuthServiceServer).ChangeMyUserName(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/caos.zitadel.auth.api.v1.AuthService/ChangeMyUserName",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(AuthServiceServer).ChangeMyUserName(ctx, req.(*ChangeUserNameRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _AuthService_GetMyUserEmail_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(empty.Empty)
 	if err := dec(in); err != nil {
@ -4308,6 +4383,10 @@ var _AuthService_serviceDesc = grpc.ServiceDesc{
 			MethodName: "UpdateMyUserProfile",
 			Handler:    _AuthService_UpdateMyUserProfile_Handler,
 		},
+		{
+			MethodName: "ChangeMyUserName",
+			Handler:    _AuthService_ChangeMyUserName_Handler,
+		},
 		{
 			MethodName: "GetMyUserEmail",
 			Handler:    _AuthService_GetMyUserEmail_Handler,
--- a/pkg/grpc/auth/auth.pb.gw.go
+++ b/pkg/grpc/auth/auth.pb.gw.go
--- a/pkg/grpc/auth/auth.swagger.json
+++ b/pkg/grpc/auth/auth.swagger.json
@ -614,6 +614,32 @@
        ]
      }
    },
+    "/users/me/username": {
+      "put": {
+        "operationId": "ChangeMyUserName",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "properties": {}
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/v1ChangeUserNameRequest"
+            }
+          }
+        ],
+        "tags": [
+          "AuthService"
+        ]
+      }
+    },
    "/validate": {
      "get": {
        "operationId": "Validate",
@ -665,6 +691,14 @@
        }
      }
    },
+    "v1ChangeUserNameRequest": {
+      "type": "object",
+      "properties": {
+        "user_name": {
+          "type": "string"
+        }
+      }
+    },
    "v1Changes": {
      "type": "object",
      "properties": {
--- a/pkg/grpc/auth/mock/auth.proto.mock.go
+++ b/pkg/grpc/auth/mock/auth.proto.mock.go
@ -97,6 +97,26 @@ func (mr *MockAuthServiceClientMockRecorder) ChangeMyUserEmail(arg0, arg1 interf
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ChangeMyUserEmail", reflect.TypeOf((*MockAuthServiceClient)(nil).ChangeMyUserEmail), varargs...)
 }

+// ChangeMyUserName mocks base method
+func (m *MockAuthServiceClient) ChangeMyUserName(arg0 context.Context, arg1 *auth.ChangeUserNameRequest, arg2 ...grpc.CallOption) (*emptypb.Empty, error) {
+	m.ctrl.T.Helper()
+	varargs := []interface{}{arg0, arg1}
+	for _, a := range arg2 {
+		varargs = append(varargs, a)
+	}
+	ret := m.ctrl.Call(m, "ChangeMyUserName", varargs...)
+	ret0, _ := ret[0].(*emptypb.Empty)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// ChangeMyUserName indicates an expected call of ChangeMyUserName
+func (mr *MockAuthServiceClientMockRecorder) ChangeMyUserName(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	varargs := append([]interface{}{arg0, arg1}, arg2...)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ChangeMyUserName", reflect.TypeOf((*MockAuthServiceClient)(nil).ChangeMyUserName), varargs...)
+}
+
 // ChangeMyUserPhone mocks base method
 func (m *MockAuthServiceClient) ChangeMyUserPhone(arg0 context.Context, arg1 *auth.UpdateUserPhoneRequest, arg2 ...grpc.CallOption) (*auth.UserPhone, error) {
 	m.ctrl.T.Helper()
--- a/pkg/grpc/auth/proto/auth.proto
+++ b/pkg/grpc/auth/proto/auth.proto
@ -94,6 +94,17 @@ service AuthService {
    };
  }

+  rpc ChangeMyUserName(ChangeUserNameRequest) returns (google.protobuf.Empty) {
+    option (google.api.http) = {
+      put: "/users/me/username"
+      body: "*"
+    };
+
+    option (caos.zitadel.utils.v1.auth_option) = {
+      permission: "authenticated"
+    };
+  }
+
  rpc GetMyUserEmail(google.protobuf.Empty) returns (UserEmailView) {
    option (google.api.http) = {
      get: "/users/me/email"
@ -437,6 +448,10 @@ message UpdateUserProfileRequest {
  Gender gender = 5;
 }

+message ChangeUserNameRequest {
+  string user_name = 1 [(validate.rules).string = {max_len: 200}];
+}
+
 message UserEmail {
  string id = 1;
  string email = 2;
--- a/pkg/grpc/management/management.pb.authoptions.go
+++ b/pkg/grpc/management/management.pb.authoptions.go
@ -24,8 +24,8 @@ var ManagementService_AuthMethods = authz.MethodMapping{
 		CheckParam: "",
 	},

-	"/caos.zitadel.management.api.v1.ManagementService/GetUserByEmailGlobal": authz.Option{
-		Permission: "user.read",
+	"/caos.zitadel.management.api.v1.ManagementService/GetUserByLoginNameGlobal": authz.Option{
+		Permission: "user.global.read",
 		CheckParam: "",
 	},

@ -104,6 +104,11 @@ var ManagementService_AuthMethods = authz.MethodMapping{
 		CheckParam: "",
 	},

+	"/caos.zitadel.management.api.v1.ManagementService/ChangeUserUserName": authz.Option{
+		Permission: "user.write",
+		CheckParam: "",
+	},
+
 	"/caos.zitadel.management.api.v1.ManagementService/ChangeUserEmail": authz.Option{
 		Permission: "user.write",
 		CheckParam: "",
--- a/pkg/grpc/management/management.pb.go
+++ b/pkg/grpc/management/management.pb.go
--- a/pkg/grpc/management/management.pb.gw.go
+++ b/pkg/grpc/management/management.pb.gw.go
--- a/pkg/grpc/management/mock/management.proto.mock.go
+++ b/pkg/grpc/management/mock/management.proto.mock.go
@ -357,6 +357,26 @@ func (mr *MockManagementServiceClientMockRecorder) ChangeUserPhone(arg0, arg1 in
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ChangeUserPhone", reflect.TypeOf((*MockManagementServiceClient)(nil).ChangeUserPhone), varargs...)
 }

+// ChangeUserUserName mocks base method
+func (m *MockManagementServiceClient) ChangeUserUserName(arg0 context.Context, arg1 *management.UpdateUserUserNameRequest, arg2 ...grpc.CallOption) (*emptypb.Empty, error) {
+	m.ctrl.T.Helper()
+	varargs := []interface{}{arg0, arg1}
+	for _, a := range arg2 {
+		varargs = append(varargs, a)
+	}
+	ret := m.ctrl.Call(m, "ChangeUserUserName", varargs...)
+	ret0, _ := ret[0].(*emptypb.Empty)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// ChangeUserUserName indicates an expected call of ChangeUserUserName
+func (mr *MockManagementServiceClientMockRecorder) ChangeUserUserName(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	varargs := append([]interface{}{arg0, arg1}, arg2...)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ChangeUserUserName", reflect.TypeOf((*MockManagementServiceClient)(nil).ChangeUserUserName), varargs...)
+}
+
 // CreateLoginPolicy mocks base method
 func (m *MockManagementServiceClient) CreateLoginPolicy(arg0 context.Context, arg1 *management.LoginPolicyAdd, arg2 ...grpc.CallOption) (*management.LoginPolicy, error) {
 	m.ctrl.T.Helper()
@ -1117,26 +1137,6 @@ func (mr *MockManagementServiceClientMockRecorder) GetUserAddress(arg0, arg1 int
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetUserAddress", reflect.TypeOf((*MockManagementServiceClient)(nil).GetUserAddress), varargs...)
 }

-// GetUserByEmailGlobal mocks base method
-func (m *MockManagementServiceClient) GetUserByEmailGlobal(arg0 context.Context, arg1 *management.Email, arg2 ...grpc.CallOption) (*management.UserView, error) {
-	m.ctrl.T.Helper()
-	varargs := []interface{}{arg0, arg1}
-	for _, a := range arg2 {
-		varargs = append(varargs, a)
-	}
-	ret := m.ctrl.Call(m, "GetUserByEmailGlobal", varargs...)
-	ret0, _ := ret[0].(*management.UserView)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
-}
-
-// GetUserByEmailGlobal indicates an expected call of GetUserByEmailGlobal
-func (mr *MockManagementServiceClientMockRecorder) GetUserByEmailGlobal(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	varargs := append([]interface{}{arg0, arg1}, arg2...)
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetUserByEmailGlobal", reflect.TypeOf((*MockManagementServiceClient)(nil).GetUserByEmailGlobal), varargs...)
-}
-
 // GetUserByID mocks base method
 func (m *MockManagementServiceClient) GetUserByID(arg0 context.Context, arg1 *management.UserID, arg2 ...grpc.CallOption) (*management.UserView, error) {
 	m.ctrl.T.Helper()
@ -1157,6 +1157,26 @@ func (mr *MockManagementServiceClientMockRecorder) GetUserByID(arg0, arg1 interf
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetUserByID", reflect.TypeOf((*MockManagementServiceClient)(nil).GetUserByID), varargs...)
 }

+// GetUserByLoginNameGlobal mocks base method
+func (m *MockManagementServiceClient) GetUserByLoginNameGlobal(arg0 context.Context, arg1 *management.LoginName, arg2 ...grpc.CallOption) (*management.UserView, error) {
+	m.ctrl.T.Helper()
+	varargs := []interface{}{arg0, arg1}
+	for _, a := range arg2 {
+		varargs = append(varargs, a)
+	}
+	ret := m.ctrl.Call(m, "GetUserByLoginNameGlobal", varargs...)
+	ret0, _ := ret[0].(*management.UserView)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// GetUserByLoginNameGlobal indicates an expected call of GetUserByLoginNameGlobal
+func (mr *MockManagementServiceClientMockRecorder) GetUserByLoginNameGlobal(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	varargs := append([]interface{}{arg0, arg1}, arg2...)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetUserByLoginNameGlobal", reflect.TypeOf((*MockManagementServiceClient)(nil).GetUserByLoginNameGlobal), varargs...)
+}
+
 // GetUserEmail mocks base method
 func (m *MockManagementServiceClient) GetUserEmail(arg0 context.Context, arg1 *management.UserID, arg2 ...grpc.CallOption) (*management.UserEmailView, error) {
 	m.ctrl.T.Helper()
--- a/pkg/grpc/management/proto/management.proto
+++ b/pkg/grpc/management/proto/management.proto
@ -81,14 +81,14 @@ service ManagementService {
    };
  }

-  // GetUserByEmailGlobal returns User, global search is overall organisations
-  rpc GetUserByEmailGlobal(Email) returns (UserView) {
+  // GetUserByLoginNameGlobal returns User, global search is overall organisations
+  rpc GetUserByLoginNameGlobal(LoginName) returns (UserView) {
    option (google.api.http) = {
-      get: "/global/users/_byemail"
+      get: "/global/users/_byloginname"
    };

    option (caos.zitadel.utils.v1.auth_option) = {
-      permission: "user.read"
+      permission: "user.global.read"
    };
  }

@ -254,6 +254,16 @@ service ManagementService {
    };
  }

+  rpc ChangeUserUserName(UpdateUserUserNameRequest) returns (google.protobuf.Empty) {
+    option (google.api.http) = {
+      get: "/users/{id}/username"
+    };
+
+    option (caos.zitadel.utils.v1.auth_option) = {
+      permission: "user.write"
+    };
+  }
+
  rpc ChangeUserEmail(UpdateUserEmailRequest) returns (UserEmail) {
    option (google.api.http) = {
      put: "/users/{id}/email"
@ -1459,8 +1469,8 @@ message UserID {
  string id = 1;
 }

-message Email {
-  string email = 1;
+message LoginName {
+  string login_name = 1;
 }

 message UniqueUserRequest {
@ -1648,6 +1658,11 @@ message UpdateUserProfileRequest {
  Gender gender = 6;
 }

+message UpdateUserUserNameRequest {
+  string id = 1;
+  string user_name = 2 [(validate.rules).string = {min_len: 1, max_len: 200}];
+}
+
 message UserEmail {
  string id = 1;
  string email = 2;