I\'m new to android development, since a long time, I\'m stuck in one error that is Run your app to verify installation (Checking if the app has communicated with our servers. Y
None of the above answers helped me. But @kotlinski's answer helped me to go AndroidManifest.xml to check issue. In my case, this was the entry in AndroidManifest.xml.
I just modified it to true, in order to make things work. Immediately I got message on FCM console 'Congratulations, you've successfully added Firebase to your app! '