After the upgrade to 10.7, all of my regular users (and myself) are reporting a constant unread message notification. I have gone through all of my teams, and made sure I have no unread messages. I cannot get this notification to go away (present in both the desktop app and the web interface). It’s causing people to ignore new messages because they always see the notification. Not sure if related, but the mobile app has also been acting funny with unread messages and mentions not getting updated. Any help or insight would be appreciated.
Welcome to the community, @Cjmny! 
Thanks for bringing this up. This sounds similar to a known issue we’re tracking; In the meantime, I’m hoping this thread might be helpful? [SOLVED] After upgrading to 5.29 messages fail to mark as read - #4 by thousandlegs
@john.combs I was able to resolve this issue by unarchiving Teams. Seems like it may be a bug, but once I was able to mark channels as read on the archived Teams, the notification went away.
Thank you for the reply!
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Awesome! Glad to hear you got it figured out, Cjmny! Thanks for following up to let us know.