I had big trouble figuring out why I was getting a "MismatchSenderId" status.
I added the gms dependency in the root build.gradle
but my error was actually not applying the gms plugin in the app build.gradle
.
If you have don't have this line in the app build.gradle
, this could be the reason why the notification are not working:
apply plugin: 'com.google.gms.google-services'