Salam,
i have tried the messaging app from quickstart-unity-master and it was working fine on it's own but when i have added the Facebook plugin the following happened ,
the firebase FCM is initializing successfully but i am no longer receiving the OnMessageReceived and OnTokenReceived
it is probably something have to do with the "com.google.firebase.MessagingUnityPlayerActivity" activity not receiving the events, but i am not sure what is wrong since the Android manifest it is still the same after adding facebook
attached the android manifest ,
and i am using facebook 7.10.1