How to properly connect Parse to Firebase

I am trying to connect the Parse server of my application to Firebase, such that we can switch to Firebase Cloud Messaging. I followed the tutorials from Google on how to setup FCM on Android and on how to Migrate your Parse Android App to Firebase. Also, the Parse server has been configured with the correct Firebase server key.

Firebase is connected correctly, since I am receiving the push notifications sent from the Firebase console. However, when we send a push notification from the Parse server, the notification doesn’t come in.

Did anyone experience the same issue, or does anyone have any tips on what to look at? I cannot seem to find anything related to this problem. Thanks a lot in advance!

Can you share your Parse Server configuration? Can you also take a look if you have any error message logged in your Push Status?