Multiple persons have answered in the reddit post confirming. And there is a plausible technical explanation in this HN thread (bad codec detection technique);

Multiple persons have answered in the reddit post confirming. And there is a plausible technical explanation in this HN thread (bad codec detection technique); yep this type of subject is quite usual, but this isn't surprising after all. Teams still does not support calls on Firefox for example: https://bugzilla.mozilla.org/show_bug.cgi?id=1623340 https://bugzilla.mozilla.org/show_bug.cgi?id=1623340 (like Slack).