This error means the token is UNREGISTERED which maybe uninstalled. We got a very large number of UNREGISTERED since 11.09, and it is still high on 11.10Is there anything wrong for FCM ?
You received this message because you are subscribed to the Google Groups "Firebase Google Group" group.
To unsubscribe from this group and stop receiving emails from it, send an email to firebase-tal...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/firebase-talk/e2b8e766-ce3b-4828-aab9-6c088a22e354n%40googlegroups.com.