Teams voice/video chat doesn't work on Firefox. Likewise Jitsi recommends using Chrome[0] (it does run in Firefox, they suggest if enough users are on Firefox the performance will be poor).. something to do with the WebRTC implementation.

Source: Click the voice/video chat button in teams on FF and get the popup: "This feature isn't available yet for your browser. Try the web app with Microsoft Edge or Google Chrome, or switch to the desktop app."

Since Jitsi suggests it's engine related, Opera/Edge/Chrome/Chromium/Brave probably all work fine for Teams (unless they user agent sniff)

[0]: https://community.jitsi.org/t/software-unusable-on-firefox-w...