How to use Firebase Notifications on Unity 2019.3.3f1

I'm following this guide: https://firebase.google.com/docs/cloud-messaging/unity/client

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.