Outlook Not Updating Shared Mailbox Automatically

This issue started with Version 2202 (Build 14931.20604) first released to Semi-Annual Channel on July 12, 2022. A change was made to the service on July 26, 2022, to address the issue.  The change will prevent new occurrences but does not retroactively fix broken profiles.

1. Right-click the Windows Start button, select Run, type Regedit, and then press the Enter key.

2. Navigate to this registry path: Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Profiles

3. Locate the Outlook Profile name of the profile that the shared mailbox is not updating and select it.

4. In Registry Editor choose Edit, Find, and search for registry key name: 0102663e

5. Locate this key in the profile where the parent key is just above the GroupStore as shown below.

6. Right-click on key name: 0102663e and select Delete.

7. Close Registry Editor and restart Outlook.

Verify the Shared Mailbox is updating. If it is updating correctly, you do not need to create a new Outlook profile.