I have installed PWA client of Microsoft Teams and I experienced problems with sound.
I could not hear the others but they could hear me.
What’s your experience from this application?
Is credible?
Hi there. I’m not sure about the version you use; however, I have “teams 1.5.00.23861-1” installed via the AUR & I have never had any issues with it. Hopefully you get sorted soon. R 
Where did you install this PWA and which browser is it running in?
From my experience, the best way is currently installing Edge (the -bin version from the AUR) and use the web version of Teams.
I’ve tried the AUR version and Flatpak but they all fail at one thing or another.
I did install Edge and through Edge I installed the PWA.