When in the tray - updates/refreshes take focus of other O365 windows while in use. Please keep this in the background - very frustrating.
You notice this is the teams app because it slides to the right & then back again quickly, but it does not return your focus to the email/word doc/excel sheet that it took you out of. That file/window is still on top in your browser, but you're not typing in there any longer. You have to click back into that window to regain focus to continue your work. This activity should remain in the background & not disrupt your typing along in work mode.