The fix for notifications not appearing/playing when Teams is minimized is rolling out to the public ring. We expect it to be rolled out 100% by the weekend – I’ll update this item at that point.
An error occurred while saving the commentAvani Pai commented
I also have this issue, but on my Android mobile device. My phone will buzz when there are new messages, but I won't get a banner. So my phone just buzzes and it took me a while to realize that I was getting a Teams message. If I do get banners, it happens several hours later.