My client uses Server Side-Sync for their organization and it's been working right for most of their users. We have encountered a problem though with one of their customer service reps mailbox. We have applied the Default Email Settings to all users, we approved mailboxes, we test and enable and only this user's mailbox shows a Failure status error when trying to sync Appointments, Contacts and Tasks. It's working fine for Incoming and Outgoing emails. The error is the following:
An internal Microsoft Dynamics 365 error occurred while synchronizing appointments, contacts, and tasks for the mailbox
XXXX. The mailbox didn't synchronize. The owner of the associated email server profile
Microsoft Exchange Online has been notified.
Email Server Error Code: UserPrivilegeError
Learn More We found out that the error was linked to the Security Role. When we changed the Security Role Mailbox entity permission to Business Unit privilege and we Test and Enable the mailbox again, we would get a Success status. But we don't want to grant Business Unit privileges to the customer service rep security role and we don't understand why is this user the only one with issues. He doesn't have a team license either. Is there anything specific we would need to look into?
Thanks!