function requestPermissonsIntent(app){
    const permission = [app.SupportedPermissions.NAME];
    app.askForPermission('Für eine korrekte Ausführung', permission);
}

//later in my code when asking for the userID and userName
if(app.isPermissionGranted()){
      const userName = app.getUserName().displayName;
      //getting the userName works fine

      const userUID = app.getUser().userID;
      //userUID is undefinded
      ...