How to use Firebase Notifications on Unity 2019.3.3f1

I’m following this guide: Configura una app cliente de Firebase Cloud Messaging con Unity  |  Firebase Cloud Messaging

However, when I build and run on my Android Firebase don’t connect because the plugin can’t find google-services.json

The google-services.json is inside Assets folder (as recomended).


Here is the logcat:

03-20 18:00:34.838: E/firebase(10335): Failed to read Firebase options from the app's resources. Either make sure google-services.json is included in your build or specify options explicitly.
03-20 18:00:34.848: E/Unity(10335): Failed to read Firebase options from the app's resources. Either make sure google-services.json is included in your build or specify options explicitly.

Found this workaround, posted on stackoverflow.

https://stackoverflow.com/questions/60815398/how-to-use-firebase-messaging-for-android-with-unity-windows-version-2019-3-3f1?noredirect=1#comment107605248_60815398