Failed to send FCM PUSH to device samsung SM-S938U

[itdirector]

One of my users has a Samsung Android phone and constantly misses calls (app does not ring). He knows someone tried to call him as our entire company has missed call emails setup. This is seemingly random, sometimes the app rings, sometimes it does not. Outgoing calls from the app work flawlessly.

It looks like the following error is appearing in 3CX Event Log when he misses a call:

Severity: Error
Details:
Failed to send FCM PUSH to device samsung SM-S938U(Ext.110). Received error from server: NotFound: Not Found. Find more info at: https://firebase.google.com/docs/reference/fcm/rest/v1/ErrorCode

Anyone have any ideas on why this is happening and how to fix it? The app is useless for incoming calls for him at this time, I have to forward everything sent to his extension to his cell number...

 

[DimitrisL_3CX]

Hello @itdirector

Does this behavior appears only to this device or in multiple devices?
Can you also please make sure to follow our guide Android: Not getting your calls? and there is no battery optimization on the device that may restrict the 3CX Mobile App.