To add insult, the notifications are a separate window on macOS. So when you use cmd+tab to switch _to_ Teams, you might end up in that notifications window. Even when there are no Teams notifications, that window remains. This is very painful when in full-screen mode, as cmd-tabbing to Teams simply doesn’t work.

I’m on the beta where you can switch to native notifications, but they’ve only implemented that (poorly) for chat notifications. Calls still use their own notifications. Poorly you ask? Well the notification doesn’t show the sender when posting in a group channel; it uses the group name as the notification title.