Hmm, will call check later - thanks. It's my personal Teams account and I don't think I've even actually used it to be honest... Maybe that's why I get the notificationCheck the Activity feed.
1. Go to Windows Settings > Personalisation > Taskbar. Under Taskbar items, set Chat to On.
2. Click the Chat icon on the Taskbar.
3. If the ... (What's new and more) button at the top right of the Chat window is showing a red (or some other colour) dot, then this is the issue. Click the ... button and select What's new from the popup menu. The badge number on the Teams icon should now have disappeared.