Yep, I have been using it and it works great. I had to use the --disableAutogain true arguments, my SO talking in the background would spike the mic input levels but after using the flags I had zero issues.
I didn't know that was an option! I've been running the Chrome extension to disable automatic gain. I have had better luck using Edge than Chrome for the PWA, and they have a flatpak to make it easier. The only thing I miss now is the multiple windows like you get on a Mac/Windows where the call doesn't take over the chat window.
I've been using the discontinued flatpak for the last month and it works fine.
Alongside it, I've also used the unofficial teams-for-linux flatpak which also works well.
I tried Chromium but couldn't get audio working and in Firefox, audio worked but screen sharing didn't as in, I couldn't see my lecturer's shared screen but I could see it in Chromium, so I had Firefox opened to hear the audio and was following along the shared screen on Chromium.