Notification Badge in Taskbar (set on Left side of the screen) for unread message
This could be a bug in Teams. It does not show notification badge on taskbar for new-unread message.
I have my Windows 10 Taskbar settings as Taskbar location on Left side of screen and Taskbar buttons never combine. Also, I have enabled the setting for Showing Badges. My current taskbar setting snap is attached.
In this setup, I see new message notification banner as expected but it does not show any badge count/red icon on taskbar.
My Teams application always stays open or minimized.
In the top of that, Teams's icon on taskbar also does not get Yellow highlighted upon new unread message.