We used Teams at my last job. It was unpopular and we didn't use it a whole lot since the building was small enough that we could just... ya know, yell.

Then MS introduced that weird semi-forced threaded discussion feature that make following conversations a nightmare and nobody, not a single person in the whole company, sent a message over Teams ever again. We kept running it to appear online, but literally nobody actually used it.

We did spend a fair amount of downtime talking about how much we hated Teams, though. And Azure DevOps. More than one person there considered it some of the worst software they've ever used, and they're right. It was a horrendous mess or awful UX (but tons and tons of charts for the managers to value far too highly).

That was a year and a half ago or so, maybe it's better now. But at the time, having switched to that from Gitlab, it was atrocious and we avoided it as much as we could.