Push notification are disabled

Steps to reproduce

1. Install Talk 15.0.1 (GPlay)
2. Enter user credentials to login

Expected behaviour

Notifications should be enabled and available.

Actual behaviour

Message appears (just for a couple of milliseconeds) that push notifications are disabled.

I didn't find any way to see this information afterwards (e.g. settings menu). Notifications for other apps (including nextcloud) work just fine.
See further details below (Additional information).

Device brand and model

Huawei Mate 40 Pro

Android version

11

Nextcloud Talk app version

15.0.1

Nextcloud server version

24.0.6

Talk version

14.0.5

Custom Signaling server configured

Yes (specify version in Additional Information)

Custom TURN server configured

Yes

Custom STUN server configured

Yes

Android logs

No response

Server log

No response

Additional information

Notifications were working before removing talk-android and reinstalling. Double checking the docs didn't help so far. https://github.com/nextcloud/talk-android/blob/master/docs/notifications.md

Battery optimizations are disabled for talk.

occ notification:test-push --talk <userid>
Trying to push to 3 devices

Language is set to de
Private user key size: 1704
Public user key size: 451
Identified 1 Talk devices and 2 others.

Device token:7887
Device token is valid
Device public key size: 451
Data to encrypt is: {"nid":25490,"app":"admin_notification_talk","subject":"Testing push notifications","type":"admin_notifications","id":"6357dacb"}
Signed encrypted push subject
Push notification sent successfully

Start by reproducing the issue on a Huawei Mate 40 Pro running Android 11 with Talk 15.0.1, then review docs/notifications.md and the supplied occ notification:test-push --talk output. Done means determining why Talk reports push notifications as disabled and restoring visible, working notifications after login.