When you click the Test & Enable Mailbox button on a mailbox record in Dynamics 365, the following alert is logged and Appointment, Contacts, and Tasks synchronization fails:
"Appointments, contacts, and tasks can't be synchronized for the mailbox <Mailbox Name> because the mailbox user doesn't have sufficient permissions on this mailbox.
Email Server Error Code: Crm.80042f09.UserNotAssignedRoles"
If you click to view the Details, the following additional details are shown:
T:1738ActivityId: 3594490d-96d3-493b-861e-023b016a6050>Exception : Unhandled Exception: Microsoft.Crm.Asynchronous.EmailConnector.ExchangeSyncException: Failed to retrieve the sync state : Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=188.8.131.52, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: SecLib::RetrievePrivilegeForUser failed - no roles are assigned to user. Returned hr = -2147209463, User: <GUID>Detail: 3594490d-96d3-493b-861e-023b016a6050 -2147209463 SecLib::RetrievePrivilegeForUser failed - no roles are assigned to user. Returned hr = -2147209463, User: <GUID>...
A Dynamics 365 security role is not assigned to the user.