[mort96]

You're right that when it comes to audio, there can be hardware + OS specific issues. But we're talking systems as different as aarch64 MacBook Pro running macOS with built-in mic and speakers on one hand a amd64 desktop running Ubuntu with a USB headset on the other hand both consistently exhibiting the exact same issue, but only in Firefox (not Chrome, not Discord, not TeamSpeak). My money's on that being a Firefox issue.

And the issue in Firefox across both those wildly different systems is present in Microsoft Teams, Google Meet and (I believe) Slack's Huddle.

Microsoft has the resources to make it work, sure, but I'm betting "making it work" here means fixing the issue in Firefox.