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Sorry to hear you’re facing problems 
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Some useful links to gather information about your Nextcloud Talk installation:
Information about Signaling server: /index.php/index.php/settings/admin/talk#signaling_server
Information about TURN server: /index.php/settings/admin/talk#turn_server
Information about STUN server: /index.php/settings/admin/talk#stun_server
Nextcloud version (eg, 24.0.1): 30.0.10 - 30.0.10.1
Talk Server version (eg, 14.0.2): 20.1.6
Custom Signaling server configured: nextcloud-aio
Custom TURN server configured: yes
Custom STUN server configured: yes
In case mobile Nextcloud Talk apps are involved:
Talk Android version (eg, 14.0.2): all
The issue you are facing:
Hi, I am running nextcloid-aio behind haproxy using a stun/turn server. Up until recently notifications went through just fine on all devices, and they still do on Windows. However, on Android you cannot see a call is coming through unless you open talk and click on that contact and then the dialog to answer comes up. I have the Google store version, grudgingly, installed because I remember seeing a warning that the non-google apk cannot send push notifications. I don’t think I changed any settings on the firewall or proxy that would have affected this. I’ve run occ notification:test-push --talk [user] - it’s great that the test is there… but there’s no information about why it’s failing, just the response below. If there’s any other information I can provide please let me know. Thanks!
I previously created an issue on github and did not get anywhere.
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
- Make call to any android phone using Nextcloud talk
The output of your Nextcloud log in Admin > Logging or errors in nextcloud.log in /var/www/:
Not sure which logs on which box
The output of your Apache/nginx/system log in /var/log/____:
Not sure which logs on which box
$nxocc notification:test-push --talk rob
Testing Talk clients:
Language is set to en
Private user key size: 1704
Public user key size: 451
Found 1 devices registered for push notifications
Identified 1 Talk devices and 0 others.
Trying to push to 1 devices
Device token:66
Device token is valid
Device public key size: 450
Data to encrypt is: {"nid":488,"app":"admin_notification_talk","subject":"Testing push notifications","type":"admin_notifications","id":"68264b7f"}
Signed encrypted push subject
Push notification sent, but 1 failed