I had a working installation, but after some unattended upgrades, and moving from Debian 10 to Debian 11, it seems that Jitsi broke, since any attempt to start a room results in an error popping up, claiming that you have been disconnected and to check your internet connection. I then opened up the browser logs and saw the following errors:
The things that stood out to me were that POST https(colon)//meet(dot)techiedamien.xyz/http-bind?room=worthystarscarrynow returned a 404 error, however, curl-ing it from my machine results in a 200. Additionally strophe is claiming that there are 404 errors when trying to retrieve some scripts, all of which I can get when manually putting in the address, such as https://meet.techiedamien.xyz/libs/lib-jitsi-meet.min.js. And then finally, the XMPP connection gets dropped, likely due to the previous 404 errors.
it is to be expected. Not the unattended upgrades, but upgrading the distro itself while you have installed PPAs (Jitsi-meet and probably Prosody).
Before upgrading your distro, always remove all PPAs installed packages, as this kind of setup is never tested by the distro developers…