In the classic Outlook I can add Inbox folders of shared mailboxes to Favorites, easily detecting and accessing new emails sent to any of mailboxes I manage. In the new Monarch Outlook, this is no l...
I don't know when they resolved it, but it is now working for me. Everything takes longer to get to GCC, but it is finally working here.
I did upgrade from O365 to M365 a few months ago. That may have been part of the difference. Maybe.