Hi Backendless,
We are seeing very similar behavior in our Android app, which has been running on BL for over 4 years. Now we get the same crash with “Failed resolution of FirebaseInstanceId” in com.Backendless.push.FCMRegistration (line #51). We are using Backendless 6.3.4.
This happens when Backendless.Messaging.registerDevice() is called. There is no Backendless handleFault() message - just a hard crash. It looks like this started happening over a month ago. We are trying different versions of the firebase dependencies, but so far no luck.
Please let us know if there is any news on this issue.
Thanks in advance,
Rick Cataldo
PS: I have also posted this reply to the topic - Backendless.messaging.registerDevice crash app