Our Office 365 had just been upgraded to 2013 last week, and today we realized that all the email forwarding settings have disappeared. When I try to configure forwarding to a mailbox, this error appears:
The operation on mailbox "<mailbox>" failed because it's out of the current user's write scope. The action 'Set-Mailbox', 'EmailAddresses', can't be performed on the object '<mailbox>' because the object is being synchronized from your on-premises organization. This action should be performed on the object in your on-premises organization.
We are using DirSync, but we do not have Exchange on-premises. All our mailboxes are on Exchange Online.