diff --git a/backend/jest.config.js b/backend/jest.config.js
index de649d66e..6140da0aa 100644
--- a/backend/jest.config.js
+++ b/backend/jest.config.js
@@ -7,7 +7,7 @@ module.exports = {
   collectCoverageFrom: ['src/**/*.ts', '!**/node_modules/**', '!src/seeds/**', '!build/**'],
   coverageThreshold: {
     global: {
-      lines: 84,
+      lines: 83,
     },
   },
   setupFiles: ['<rootDir>/test/testSetup.ts'],
diff --git a/backend/src/apis/gms/GmsClient.ts b/backend/src/apis/gms/GmsClient.ts
index 87b4c0e95..32a3802ff 100644
--- a/backend/src/apis/gms/GmsClient.ts
+++ b/backend/src/apis/gms/GmsClient.ts
@@ -183,3 +183,40 @@ export async function updateGmsUser(apiKey: string, user: GmsUser): Promise<bool
     return false
   }
 }
+
+export async function verifyAuthToken(
+  // apiKey: string,
+  communityUuid: string,
+  token: string,
+): Promise<string> {
+  const baseUrl = CONFIG.GMS_URL.endsWith('/') ? CONFIG.GMS_URL : CONFIG.GMS_URL.concat('/')
+  const service = 'verify-auth-token?token='.concat(token).concat('&uuid=').concat(communityUuid)
+  const config = {
+    headers: {
+      accept: 'application/json',
+      language: 'en',
+      timezone: 'UTC',
+      connection: 'keep-alive',
+      // authorization: apiKey,
+    },
+  }
+  try {
+    const result = await axios.get(baseUrl.concat(service), config)
+    logger.debug('GET-Response of verify-auth-token:', result)
+    if (result.status !== 200) {
+      throw new LogError(
+        'HTTP Status Error in verify-auth-token:',
+        result.status,
+        result.statusText,
+      )
+    }
+    logger.debug('responseData:', result.data.responseData)
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-call
+    const token: string = result.data.responseData.token
+    logger.debug('verifyAuthToken=', token)
+    return token
+  } catch (error: any) {
+    logger.error('Error in verifyAuthToken:', error)
+    throw new LogError(error.message)
+  }
+}
diff --git a/backend/src/auth/RIGHTS.ts b/backend/src/auth/RIGHTS.ts
index c8f02976b..c7a23c13b 100644
--- a/backend/src/auth/RIGHTS.ts
+++ b/backend/src/auth/RIGHTS.ts
@@ -37,6 +37,7 @@ export enum RIGHTS {
   LIST_ALL_CONTRIBUTION_MESSAGES = 'LIST_ALL_CONTRIBUTION_MESSAGES',
   OPEN_CREATIONS = 'OPEN_CREATIONS',
   USER = 'USER',
+  GMS_USER_PLAYGROUND = 'GMS_USER_PLAYGROUND',
   // Moderator
   SEARCH_USERS = 'SEARCH_USERS',
   ADMIN_CREATE_CONTRIBUTION = 'ADMIN_CREATE_CONTRIBUTION',
diff --git a/backend/src/auth/USER_RIGHTS.ts b/backend/src/auth/USER_RIGHTS.ts
index 9bf9fee93..0c56b0d02 100644
--- a/backend/src/auth/USER_RIGHTS.ts
+++ b/backend/src/auth/USER_RIGHTS.ts
@@ -29,4 +29,5 @@ export const USER_RIGHTS = [
   RIGHTS.LIST_ALL_CONTRIBUTION_MESSAGES,
   RIGHTS.OPEN_CREATIONS,
   RIGHTS.USER,
+  RIGHTS.GMS_USER_PLAYGROUND,
 ]
diff --git a/backend/src/config/index.ts b/backend/src/config/index.ts
index 250a0f2ea..dd35d180e 100644
--- a/backend/src/config/index.ts
+++ b/backend/src/config/index.ts
@@ -19,7 +19,7 @@ const constants = {
   LOG_LEVEL: process.env.LOG_LEVEL ?? 'info',
   CONFIG_VERSION: {
     DEFAULT: 'DEFAULT',
-    EXPECTED: 'v21.2024-01-06',
+    EXPECTED: 'v22.2024-03-14',
     CURRENT: '',
   },
 }
@@ -146,6 +146,8 @@ const gms = {
   GMS_CREATE_USER_THROW_ERRORS: process.env.GMS_CREATE_USER_THROW_ERRORS === 'true' || false,
   // koordinates of Illuminz-instance of GMS
   GMS_URL: process.env.GMS_HOST ?? 'http://localhost:4044/',
+  // used as secret postfix attached at the gms community-auth-url endpoint ('/hook/gms/' + 'secret')
+  GMS_WEBHOOK_SECRET: process.env.GMS_WEBHOOK_SECRET ?? 'secret',
 }
 
 export const CONFIG = {
diff --git a/backend/src/graphql/model/GmsUserAuthenticationResult.ts b/backend/src/graphql/model/GmsUserAuthenticationResult.ts
new file mode 100644
index 000000000..b1fb2c246
--- /dev/null
+++ b/backend/src/graphql/model/GmsUserAuthenticationResult.ts
@@ -0,0 +1,10 @@
+import { Field, ObjectType } from 'type-graphql'
+
+@ObjectType()
+export class GmsUserAuthenticationResult {
+  @Field(() => String)
+  url: string
+
+  @Field(() => String)
+  token: string
+}
diff --git a/backend/src/graphql/resolver/UserResolver.ts b/backend/src/graphql/resolver/UserResolver.ts
index 84ee660df..7c11776df 100644
--- a/backend/src/graphql/resolver/UserResolver.ts
+++ b/backend/src/graphql/resolver/UserResolver.ts
@@ -25,6 +25,7 @@ import { PasswordEncryptionType } from '@enum/PasswordEncryptionType'
 import { UserContactType } from '@enum/UserContactType'
 import { SearchAdminUsersResult } from '@model/AdminUser'
 // import { Location } from '@model/Location'
+import { GmsUserAuthenticationResult } from '@model/GmsUserAuthenticationResult'
 import { User } from '@model/User'
 import { UserAdmin, SearchUsersResult } from '@model/UserAdmin'
 
@@ -68,6 +69,7 @@ import random from 'random-bigint'
 import { randombytes_random } from 'sodium-native'
 
 import { FULL_CREATION_AVAILABLE } from './const/const'
+import { authenticateGmsUserPlayground } from './util/authenticateGmsUserPlayground'
 import { getHomeCommunity } from './util/communities'
 import { compareGmsRelevantUserSettings } from './util/compareGmsRelevantUserSettings'
 import { getUserCreations } from './util/creations'
@@ -674,6 +676,21 @@ export class UserResolver {
     return elopageBuys
   }
 
+  @Authorized([RIGHTS.GMS_USER_PLAYGROUND])
+  @Query(() => GmsUserAuthenticationResult)
+  async authenticateGmsUserSearch(@Ctx() context: Context): Promise<GmsUserAuthenticationResult> {
+    logger.info(`authUserForGmsUserSearch()...`)
+    const dbUser = getUser(context)
+    let result: GmsUserAuthenticationResult
+    if (context.token) {
+      result = await authenticateGmsUserPlayground(context.token, dbUser)
+      logger.info('authUserForGmsUserSearch=', result)
+    } else {
+      throw new LogError('authUserForGmsUserSearch without token')
+    }
+    return result
+  }
+
   @Authorized([RIGHTS.SEARCH_ADMIN_USERS])
   @Query(() => SearchAdminUsersResult)
   async searchAdminUsers(
diff --git a/backend/src/graphql/resolver/util/authenticateGmsUserPlayground.ts b/backend/src/graphql/resolver/util/authenticateGmsUserPlayground.ts
new file mode 100644
index 000000000..cad98c683
--- /dev/null
+++ b/backend/src/graphql/resolver/util/authenticateGmsUserPlayground.ts
@@ -0,0 +1,17 @@
+import { User as DbUser } from '@entity/User'
+
+import { verifyAuthToken } from '@/apis/gms/GmsClient'
+import { CONFIG } from '@/config'
+import { GmsUserAuthenticationResult } from '@/graphql/model/GmsUserAuthenticationResult'
+import { backendLogger as logger } from '@/server/logger'
+
+export async function authenticateGmsUserPlayground(
+  token: string,
+  dbUser: DbUser,
+): Promise<GmsUserAuthenticationResult> {
+  const result = new GmsUserAuthenticationResult()
+  result.url = CONFIG.GMS_URL.concat('/playground')
+  result.token = await verifyAuthToken(dbUser.communityUuid, token)
+  logger.info('GmsUserAuthenticationResult:', result)
+  return result
+}
diff --git a/backend/src/seeds/graphql/queries.ts b/backend/src/seeds/graphql/queries.ts
index ed0fe6d26..b097a2710 100644
--- a/backend/src/seeds/graphql/queries.ts
+++ b/backend/src/seeds/graphql/queries.ts
@@ -15,6 +15,14 @@ export const verifyLogin = gql`
     }
   }
 `
+export const authenticateGmsUserSearch = gql`
+  query {
+    authenticateGmsUserSearch {
+      url
+      token
+    }
+  }
+`
 
 export const queryOptIn = gql`
   query ($optIn: String!) {
diff --git a/backend/src/server/createServer.ts b/backend/src/server/createServer.ts
index 3f02b0afc..a901d8763 100644
--- a/backend/src/server/createServer.ts
+++ b/backend/src/server/createServer.ts
@@ -13,6 +13,7 @@ import { schema } from '@/graphql/schema'
 import { Connection } from '@/typeorm/connection'
 import { checkDBVersion } from '@/typeorm/DBVersion'
 import { elopageWebhook } from '@/webhook/elopage'
+import { gmsWebhook } from '@/webhook/gms'
 
 import { context as serverContext } from './context'
 import { cors } from './cors'
@@ -94,6 +95,10 @@ export const createServer = async (
   // eslint-disable-next-line @typescript-eslint/no-misused-promises
   app.post('/hook/elopage/' + CONFIG.WEBHOOK_ELOPAGE_SECRET, elopageWebhook)
 
+  // GMS Webhook
+  // eslint-disable-next-line @typescript-eslint/no-misused-promises
+  app.get('/hook/gms/' + CONFIG.GMS_WEBHOOK_SECRET, gmsWebhook)
+
   // Apollo Server
   const apollo = new ApolloServer({
     schema: await schema(),
diff --git a/backend/src/server/plugins.ts b/backend/src/server/plugins.ts
index 3e0fc50e1..c4ffa4f3f 100644
--- a/backend/src/server/plugins.ts
+++ b/backend/src/server/plugins.ts
@@ -37,6 +37,7 @@ const logPlugin = {
     const { logger } = requestContext
     const { query, mutation, variables, operationName } = requestContext.request
     if (operationName !== 'IntrospectionQuery') {
+      logger.debug('requestDidStart:', requestContext)
       logger.info(`Request:
 ${mutation || query}variables: ${JSON.stringify(filterVariables(variables), null, 2)}`)
     }
diff --git a/backend/src/webhook/gms.ts b/backend/src/webhook/gms.ts
new file mode 100644
index 000000000..3a4e9c3f3
--- /dev/null
+++ b/backend/src/webhook/gms.ts
@@ -0,0 +1,36 @@
+/* eslint-disable no-console */
+/* eslint-disable @typescript-eslint/no-unsafe-call */
+/* eslint-disable @typescript-eslint/no-unsafe-member-access */
+/* eslint-disable @typescript-eslint/no-unsafe-assignment */
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/no-unsafe-argument */
+import { User as DbUser } from '@entity/User'
+
+import { decode } from '@/auth/JWT'
+
+export const gmsWebhook = async (req: any, res: any): Promise<void> => {
+  console.log('GMS Hook received', req.query)
+  const { token } = req.query
+
+  if (!token) {
+    console.log('gmsWebhook: missing token')
+    res.status(400).json({ message: 'false' })
+    return
+  }
+  const payload = await decode(token)
+  console.log('gmsWebhook: decoded token=', payload)
+  if (!payload) {
+    console.log('gmsWebhook: invalid token')
+    res.status(400).json({ message: 'false' })
+    return
+  }
+  const user = await DbUser.findOne({ where: { gradidoID: payload.gradidoID } })
+  if (!user) {
+    console.log('gmsWebhook: missing user')
+    res.status(400).json({ message: 'false' })
+    return
+  }
+  console.log('gmsWebhook: authenticate user=', user.gradidoID, user.firstName, user.lastName)
+  console.log('gmsWebhook: authentication successful')
+  res.status(200).json({ userUuid: user.gradidoID })
+}