After configuring Server Side Sync and testing a mailbox I get the below error. The user that was test has a Dynamics 365 licence assigned to them. What could be causing this issue?
mail can't be sent for the mailbox "Test Message" because the associated user doesn't have a valid Microsoft Dynamics 365 license. The mailbox didn't synchronize. A notification about this is posted on the alerts wall for the owner of the email server profile