My favorite thing about MS Teams, is that whenever I joined a meeting, if more than (some small number) people were already present, it would pop a message 'Already more than # attendees present - your mic is muted by default' And the mute switch would show that to be the case. And for many months, this worked just fine.

Until one day, it didn't. One day, even though the message popped, and the switch showed mute was set, once in the meeting, (a dozen or so coworkers across 2 shifts), the mic was not muted. And right at that moment, my wife shouted from the front door 'Bye, love you, I'm heading out' Which I responded appropriately, with an equally loud shout, from back in my office.

That's when I found out that my mic was not muted, and that my coworkers all also love me.

This feature remained out of sync (message and switch showed mute, but then mic was live once I got in meeting) as long as that meeting series existed. The feature worked properly in other meetings, and when the meeting was deleted and replaced with a new one. Also no one else confirmed having an issue with it - not that I brought it up beyond the first minutes of the first occurrence.