Foreground Service Demo doesn't work Anymore on Android 11 about monodroid-samples HOT 3 OPEN

 void RegisterForegroundService()
 {
     NotificationChannel chan = new NotificationChannel("my_service_urgent", "My Channel", NotificationImportance.None);
     chan.EnableVibration(true);
     chan.LockscreenVisibility = NotificationVisibility.Secret;
     NotificationManager notificationManager = GetSystemService(NotificationService) as NotificationManager;
     notificationManager.CreateNotificationChannel(chan);

     var notification = new Notification.Builder(this, "my_service_urgent")
         .SetContentTitle(Resources.GetString(Resource.String.app_name))
         .SetContentText(Resources.GetString(Resource.String.notification_text))
         .SetSmallIcon(Resource.Drawable.ic_stat_name)
         .SetContentIntent(BuildIntentToShowMainActivity())
         .SetOngoing(true)
         .AddAction(BuildRestartTimerAction())
         .AddAction(BuildStopServiceAction())
         .Build();
     StartForeground(Constants.SERVICE_RUNNING_NOTIFICATION_ID, notification);
 }