Users can't view the Outlook Delegates page in Office 365

Applies to: Exchange Online

Symptoms


Users can't view delegate permissions in Microsoft Outlook in Microsoft Office 365. Additionally, they receive the following error message:

 

Cause


Outlook can't correctly retrieve the delegate information from the local free/busy object in the mailbox. This issue may occur after the manager's or delegate's mailbox is moved to a new forest.

Resolution


To resolve this issue, set a new temporary delegate in the manager's mailbox by using Outlook Web App (OWA) to force updating of the local free/busy object. To do this, follow these steps: 

  1. Sign in to the mailbox through OWA.
  2. Open the calendar.
  3. Select Share from the menu at the top. 

    A screenshot of the Share button on the Outlook page
  4. Enter a user or group, and then select Delegate from the drop-down menu.

    A screenshot of the selecting Delegate in the drop down menu page
  5. Click Share, and then click Done

    A screenshot of Share page

The manager should now be able to return to Outlook to continue management of the delegates from the client.