diff --git a/admin/src/components/ContributionMessages/ContributionMessagesList.spec.js b/admin/src/components/ContributionMessages/ContributionMessagesList.spec.js
index 46773c7d8..a47c78601 100644
--- a/admin/src/components/ContributionMessages/ContributionMessagesList.spec.js
+++ b/admin/src/components/ContributionMessages/ContributionMessagesList.spec.js
@@ -71,7 +71,8 @@ const defaultData = {
 const defaultUser = {
   firstName: 'Peter',
   lastName: 'Lustig',
-  humhubUsername: 'peter.lustig',
+  uniqueUsername: 'peter.lustig',
+  publicName: 'PeLu',
   createdAt: new Date().toString(),
   emailContact: {
     email: 'peter.lustig@example.com',
diff --git a/admin/src/components/ContributionMessages/ContributionMessagesList.vue b/admin/src/components/ContributionMessages/ContributionMessagesList.vue
index 837f2ade1..09b5a69ac 100644
--- a/admin/src/components/ContributionMessages/ContributionMessagesList.vue
+++ b/admin/src/components/ContributionMessages/ContributionMessagesList.vue
@@ -103,7 +103,7 @@ const humhubProfileLink = computed(() => {
   if (url.endsWith('/')) {
     url = url.slice(0, -1)
   }
-  return `${url}/u/${props.contribution.user.uniqueUsername}`
+  return `${url}/u/${props.contribution.user.userIdentifier}`
 })
 
 const messages = ref([])
diff --git a/admin/src/graphql/adminListContributions.graphql b/admin/src/graphql/adminListContributions.graphql
index f98c9083f..dde9750af 100644
--- a/admin/src/graphql/adminListContributions.graphql
+++ b/admin/src/graphql/adminListContributions.graphql
@@ -14,7 +14,7 @@ query adminListContributions(
         }
         ...UserCommonFields
         publicName
-        uniqueUsername
+        userIdentifier
         createdAt
       }
       amount
diff --git a/backend/src/apis/humhub/model/Account.ts b/backend/src/apis/humhub/model/Account.ts
index 1ccc911ad..934b8931e 100644
--- a/backend/src/apis/humhub/model/Account.ts
+++ b/backend/src/apis/humhub/model/Account.ts
@@ -8,7 +8,7 @@ import { PublishNameType } from '@/graphql/enum/PublishNameType'
 export class Account {
   public constructor(user: User) {
     const publishNameLogic = new PublishNameLogic(user)
-    this.username = publishNameLogic.getUniqueUsername(user.humhubPublishName as PublishNameType)
+    this.username = publishNameLogic.getUserIdentifier(user.humhubPublishName as PublishNameType)
     this.email = user.emailContact.email
     this.language = convertGradidoLanguageToHumhub(user.language)
     this.status = 1
diff --git a/backend/src/data/PublishName.logic.test.ts b/backend/src/data/PublishName.logic.test.ts
index 6356444f0..6db3a996c 100644
--- a/backend/src/data/PublishName.logic.test.ts
+++ b/backend/src/data/PublishName.logic.test.ts
@@ -28,27 +28,27 @@ describe('test publish name logic', () => {
     user.gradidoID = gradidoUuid
     logic = new PublishNameLogic(user)
   })
-  describe('test unique username', () => {
+  describe('test user identifier ', () => {
     it('for alias or initials with alias set', () => {
-      expect(logic.getUniqueUsername(PublishNameType.PUBLISH_NAME_ALIAS_OR_INITALS)).toBe('alias')
+      expect(logic.getUserIdentifier(PublishNameType.PUBLISH_NAME_ALIAS_OR_INITALS)).toBe('alias')
     })
     it('for alias or initials with empty alias', () => {
       user.alias = ''
-      expect(logic.getUniqueUsername(PublishNameType.PUBLISH_NAME_ALIAS_OR_INITALS)).toBe(
+      expect(logic.getUserIdentifier(PublishNameType.PUBLISH_NAME_ALIAS_OR_INITALS)).toBe(
         gradidoUuid,
       )
     })
     it('for publish name initials', () => {
-      expect(logic.getUniqueUsername(PublishNameType.PUBLISH_NAME_INITIALS)).toBe(gradidoUuid)
+      expect(logic.getUserIdentifier(PublishNameType.PUBLISH_NAME_INITIALS)).toBe(gradidoUuid)
     })
     it('for publish name first', () => {
-      expect(logic.getUniqueUsername(PublishNameType.PUBLISH_NAME_FIRST)).toBe(gradidoUuid)
+      expect(logic.getUserIdentifier(PublishNameType.PUBLISH_NAME_FIRST)).toBe(gradidoUuid)
     })
     it('for publish name first initial', () => {
-      expect(logic.getUniqueUsername(PublishNameType.PUBLISH_NAME_FIRST_INITIAL)).toBe(gradidoUuid)
+      expect(logic.getUserIdentifier(PublishNameType.PUBLISH_NAME_FIRST_INITIAL)).toBe(gradidoUuid)
     })
     it('for publish name full', () => {
-      expect(logic.getUniqueUsername(PublishNameType.PUBLISH_NAME_FULL)).toBe(gradidoUuid)
+      expect(logic.getUserIdentifier(PublishNameType.PUBLISH_NAME_FULL)).toBe(gradidoUuid)
     })
   })
 
diff --git a/backend/src/data/PublishName.logic.ts b/backend/src/data/PublishName.logic.ts
index 70fab21cd..c7935b289 100644
--- a/backend/src/data/PublishName.logic.ts
+++ b/backend/src/data/PublishName.logic.ts
@@ -65,7 +65,7 @@ export class PublishNameLogic {
    * return alias
    * else return gradido id
    */
-  public getUniqueUsername(publishNameType: PublishNameType): string {
+  public getUserIdentifier(publishNameType: PublishNameType): string {
     return this.isUsernameFromAlias(publishNameType)
       ? this.filterOutInvalidChar(this.user.alias)
       : this.user.gradidoID
diff --git a/backend/src/graphql/model/User.ts b/backend/src/graphql/model/User.ts
index 970ff28b3..e7a8288f0 100644
--- a/backend/src/graphql/model/User.ts
+++ b/backend/src/graphql/model/User.ts
@@ -28,7 +28,7 @@ export class User {
       const publishNameLogic = new PublishNameLogic(user)
       const publishNameType = user.humhubPublishName as PublishNameType
       this.publicName = publishNameLogic.getPublicName(publishNameType)
-      this.uniqueUsername = publishNameLogic.getUniqueUsername(publishNameType)
+      this.userIdentifier = publishNameLogic.getUserIdentifier(publishNameType)
 
       if (user.emailContact) {
         this.emailChecked = user.emailContact.emailChecked
@@ -76,7 +76,7 @@ export class User {
   publicName: string | null
 
   @Field(() => String, { nullable: true })
-  uniqueUsername: string | null
+  userIdentifier: string | null
 
   @Field(() => String, { nullable: true })
   firstName: string | null
diff --git a/backend/src/graphql/resolver/UserResolver.ts b/backend/src/graphql/resolver/UserResolver.ts
index bbac91597..518ef9f46 100644
--- a/backend/src/graphql/resolver/UserResolver.ts
+++ b/backend/src/graphql/resolver/UserResolver.ts
@@ -833,7 +833,7 @@ export class UserResolver {
       throw new LogError('cannot create humhub client')
     }
     const userNameLogic = new PublishNameLogic(dbUser)
-    const username = userNameLogic.getUniqueUsername(dbUser.humhubPublishName as PublishNameType)
+    const username = userNameLogic.getUserIdentifier(dbUser.humhubPublishName as PublishNameType)
     let humhubUser = await humhubClient.userByUsername(username)
     if (!humhubUser) {
       humhubUser = await humhubClient.userByEmail(dbUser.emailContact.email)