I would love to give you a "just do X" solution for it, but when I tried it roughly 5 minutes before writing my original comment, it worked without any issues (on a somewhat up-to-date Arch Linux). Everybody in the call could hear me, see my webcam and look at my screen share.

I'll keep my fingers crossed for you to get it working, though.

I haven’t tried it for half year, maybe something has changed. I have Arch Linux as well. It could not find audio devices on Firefox when using Teams. This happened with two different devices.

As side note, I only use Firefox Developer edition, but I doubt they have significant differences on this matter.

How did you get screen sharing to work? I never managed to get it to work on fedora in either chromium or Firefox. Something to do with wayland or not. Jitsi however worked the first time I tried it.

Wayland requires some additional work.

You need to install correct xdg-portal. Chromium also requires specific flag before WebRTC works.

https://wiki.archlinux.org/title/PipeWire#xdg-desktop-portal...

Have you looked at your microphone's volume in your OS's settings?

It does not find devices at all.