group chats don't show up anywhere - but it shows a notification for new messages
Group chats don't show up under the "Chat" menu item - but the notification shows "1" for a new message. You have to guess who might have sent you something by typing in the search at the top of teams and going through all your group chats. The only work around I've found at this point is to flag each group chat as a "favorite".. This is silly..