Using Classic Outlook on Windows for personal email, calendar, and contact management
I have also been having this issue over the last few days, and like the OP I am in New Zealand. One additional symptom is that the Teams icon on the Taskbar shows a "new" badge, and flashes orange like it has a notification or popup dialogue box that needs my attention. Once I mouse focus on Teams there is no visible notification or popup that requires any action by me.