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

Original KB number:   4038583

Symptoms

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

The Delegates page is not available. Cannot access the Outlook folder.

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.

   

4. Enter a user or group, and then select Delegate from the drop-down menu.

   

5. Select Share, and then select Done.

   

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