I've been an msft employee for a couple of years and teams... Was ok. I prefer slack, but meetings, video, messaging, formatting, etc. was just fine in teams.
It's control-space. It is global on Windows as far as I know. Unfortunately you can't change it because I would love to have a single key I don't normally use assigned to it. I use a Mac keyboard with 19 function keys so there's plenty that I would never touch.
I agree with all the other criticism by the way, it's a messy slow clusterf*k.
And it would be a problem if it was, as ctrl shift is the default binding for show suggestions in IntelliJ and Rider.
All of the following you've already mentioned but I forgot you mentioning them in my rage at MS. Figuring out if I'm holding it wrong or not revealed another silly issue however: the push to talk button is hard coded to ctrl space, unlike other keybinds it doesn't show up in the keybinds dialog.
Seriously, it's outlook levels of broken. Markdown doesn't work, I don't know what markdown engine they use but it's certainly not compliant to any sort of standard. Copying whitespace is just unbelievably fucked, your code becomes unreadable.
Which would be fine... If we could bulk indent. But do you know what highlight + tab does? Not indent, no, it selects the send button.
Teams, fuck you.