I wonder if there has been any changes to Record Creation Rules, as cases no longer gets created when an email is sent from an internal user.
Previously, the contact with the corresponding email would be applied to the From field, but not anymore.
I am assuming cases are not being created, as the user cannot be put on the contact field on the case, which is a required field.
User:
vs
Contact:

I don't know if this a Microsoft update, or if it is because of internal changes to our Outlook environment.
Is there any way to fix this?