allow indentification of shared mailboxes using graph api
The only way to identify if a user is actually a shared mailbox is using Powershell. You should also be able to identify shared mailboxes over other APIs such as graph. So that shared mailboxes can be managed from dynamic applications.
Denys Sukhanov commented
I totally agree with this suggestion.
Haris Osmanagić commented
This would definitely help a lot!
Listing all mailboxes a user has access to would also be great. Something like '/me/mailFolders/SharedWithMe'