Why does firebase push_token return Blacklisted?

Question

I am implementing Firebase messaging in my app.

While I am testing the app sends the refreshed_token to my database, but in live production environment (Play store)

Answer 1

I can conclude after researching this problem that when an emulator runs the app Firebase will return BLACKLISTED. Also thanks to @kR105

Answer 2

The App will be running on an emulator hence Firebase token will be Blacklisted

Answer 3

from Firebase support:

Hi there,

It seems that this is a known minor issue with our internal infrastructure where the device used for the Play Store review can be BLACKLISTED by GCM / FCM in some occasions. However, this should not affect your real users. We are looking beyond Firebase and working with Play Store team to avoid this inconvenience.