diff --git a/back/src/Services/AdminApi.ts b/back/src/Services/AdminApi.ts
index c9b40f03..5f6647bf 100644
--- a/back/src/Services/AdminApi.ts
+++ b/back/src/Services/AdminApi.ts
@@ -61,6 +61,17 @@ class AdminApi {
         )
         return res.data;
     }
+
+    async fetchCheckUserByToken(organizationMemberToken: string): Promise<AdminApiData> {
+        if (!ADMIN_API_URL) {
+            return Promise.reject('No admin backoffice set!');
+        }
+        //todo: this call can fail if the corresponding world is not activated or if the token is invalid. Handle that case.
+        const res = await Axios.get(ADMIN_API_URL+'/api/check-user/'+organizationMemberToken,
+            { headers: {"Authorization" : `${ADMIN_API_TOKEN}`} }
+        )
+        return res.data;
+    }
     
     reportPlayer(reportedUserUuid: string, reportedUserComment: string, reporterUserUuid: string) {
        return Axios.post(`${ADMIN_API_URL}/api/report`, {
diff --git a/back/src/Services/JWTTokenManager.ts b/back/src/Services/JWTTokenManager.ts
index 580140b0..94016b21 100644
--- a/back/src/Services/JWTTokenManager.ts
+++ b/back/src/Services/JWTTokenManager.ts
@@ -2,6 +2,7 @@ import {ALLOW_ARTILLERY, SECRET_KEY} from "../Enum/EnvironmentVariable";
 import {uuid} from "uuidv4";
 import Jwt from "jsonwebtoken";
 import {TokenInterface} from "../Controller/AuthenticateController";
+import {adminApi, AdminApiData} from "../Services/AdminApi";
 
 class JWTTokenManager {
     
@@ -32,7 +33,7 @@ class JWTTokenManager {
                 const tokenInterface = tokenDecoded as TokenInterface;
                 if (err) {
                     console.error('An authentication error happened, invalid JsonWebToken.', err);
-                    reject(new Error('An authentication error happened, invalid JsonWebToken. '+err.message));
+                    reject(new Error('An authentication error happened, invalid JsonWebToken. ' + err.message));
                     return;
                 }
                 if (tokenDecoded === undefined) {
@@ -41,12 +42,22 @@ class JWTTokenManager {
                     return;
                 }
 
+                //verify token
                 if (!this.isValidToken(tokenInterface)) {
                     reject(new Error('Authentication error, invalid token structure.'));
                     return;
                 }
 
-                resolve(tokenInterface.userUuid);
+                //verify user in admin
+                return adminApi.fetchCheckUserByToken(tokenInterface.userUuid).then(() => {
+                    resolve(tokenInterface.userUuid);
+                }).catch((err) => {
+                    //anonymous user
+                    if(err.response && err.response.status && err.response.status === 404){
+                        return resolve(tokenInterface.userUuid);
+                    }
+                    reject(new Error('Authentication error, invalid token structure. ' + err));
+                });
             });
         });
     }