Firebase token error TOO_MANY_REGISTRATIONS

Question

After reading 100\'s of threads and googling I am still confused about this following error message.

Currently, I am using Firebase Cloud Messaging and in very shor

Answer 1

After spoken directly with the Google team I got the following answer from them:

The team confirmed and clarified their data indicated that the device is not really a normal device and this is either:

1. a virtual device (emulator) being reused too many times

2. a real device used in automated way to test too many apps

3. a real device which has been customized with a CLONE image of the system partition, CLONED from a different device

If this is a real device, the best way to solve it is to factory reset to the real system image of the device. Since this device is prob currently stuck in 2 or 3, would you mind factory resetting the device and let us know if the issue still reproduce?

I have performed a factory reset on my device and the issue is gone. I still don't see exactly how this can appear and why.