Perhaps it's coincidental, since I very rarely do DBA, but after installing the latest SSMS yesterday I tried to create a database diagram for a database and received the following error:
Could not obtain information about Windows NT group/user 'AzureAD\UserId'
I am the owner of the database and one of the role members for sysadmin. I can create databases, delete them, add tables, back up and restore them, etc., but for some reason I can't create a database diagram. I'm nearly clueless when it comes to DBA, so be gentle.