If I have the teams app in the background or on another monitor does not mean I am away. Even if i don't move the mouse for some time does not usually mean I am away. Maybe I do other things, but still sitting at my desk and working.
The status should only change to "away" if i lock my computer, because then I am really "away". Maybe there should be a way to configure the time after when the status changes and one of these options should be "only when locking the computer".