If there's a problem with the payload or the token or whatever, FCM returns a boolean indicating that it was not sent successfully. Unfortunately that is not being monitored and there is no way to tell right now (with either queues or error counts) that there were a bunch of failures.
If there's a problem with the payload or the token or whatever, FCM returns a boolean indicating that it was not sent successfully. Unfortunately that is not being monitored and there is no way to tell right now (with either queues or error counts) that there were a bunch of failures.