title: Firebase push notifications not working on production apk
body: <p>Trying to use Firebase to send notifications to the Android app, everything works well when sending apk to the phone via USB. When I archive and distribute AdHoc, notifications are not working.
  My code:</p>
  
  <pre><code>[Service]
  [IntentFilter(new[] { "com.google.firebase.INSTANCE_ID_EVENT" })]
  public class MyFirebaseIIDService : FirebaseInstanceIdService
  {
      const string TAG = "MyFirebaseIIDService";
      public override void OnTokenRefresh()
      {
          var refreshedToken = FirebaseInstanceId.Instance.Token;
          Log.Debug(TAG, "Refreshed token: " + refreshedToken);
          SendRegistrationToServer(refreshedToken);
      }
      void SendRegistrationToServer(string token)
      {
          // Add custom implementation, as needed.
      }
  }
  </code></pre>