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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
Custom Signaling server configured: yes
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/…): Ubuntu (Mint)
Browser name and version (eg, Chrome v101): Chromium
Talk Linux version (eg, 14.0.2): v2.2.3 (AppImage)
The issue you are facing:
Hello Talk friends,
if I receive an invitation from another user I receive a meeting link p.e. https://talk.example.com/call/ABC123
Now I’ve written a wrapper script that finds out that I want to join a meeting and sends this link after a click in thunderbird to my installed Talk app.
The Talk app opens, but it stays on “start page” and does not open the call ABC123.
Does anybody knows if it is possible to send the Talk AppImage app an url to a meeting?
The command I use is
flatpak run com.nextcloud.talk --url "https://talk.example.com/call/ABC123"
Best regards
Tino