Support intro
Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
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): 31.0.2
Talk Server version (eg, 14.0.2): 21.0.1
Custom Signaling server configured: yes: 2.0.2
Custom TURN server configured: yes
Custom STUN server configured: yes
In case the web version of Nextcloud Talk is involved:
Operating system (eg, Windows/Ubuntu/…): replace me
Browser name and version (eg, Chrome v101): replace me
In case mobile Nextcloud Talk apps are involved:
Talk iOS version (eg, 14.0.2): replace me
Talk Android version (eg, 14.0.2): replace me
The issue you are facing: After Upgrading to Nextcloud 31.0.2 (from 30.0.n) I get this red message on the admin page:
Kein Hochleistungs-Backend konfiguriert – Ohne das Hochleistungs-Backend skaliert es nur für kleinere Meetings (max. 2–3 Teilnehmer). Bitte richten Sie das Hochleistungs-Backend ein, um sicherzustellen, dass Meetings mit mehreren Teilnehmern reibungslos funktionieren. Weitere Informationen finden Sie in der Dokumentation 
.
BUT: The server is available, the checks on the Talk page are passed:
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging or errors in nextcloud.log in /var/www/:
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
Your browser log if relevant (javascript console log, network log, etc.):
PASTE HERE