Using Microsoft Teams on macOS, including installation, features, and compatibility
And be careful if you have multiple Macs running Focus settings! I think Focus was my issue, except that my Mac at HOME was the one enabling Work focus settings, which were affecting my Mac in my office without me knowing (the alert about Work focus comes up on my home machine, but not on my office machine). I added the exception in Focus on my work Mac and now I get notifications again!
So really, I should be complaining to Apple about how complicated they've made Focus.... And the fact that it's kind of a dumb, ambiguous name....