Shared mailbox not appearing in Outlook desktop

Scenario

A shared mailbox was granted to a user in Microsoft 365, but Outlook desktop does not display it after several hours.

Recommended Resolution Path

1. Confirm the permission granted is Full Access and not only Send As.
2. Wait for Exchange Online permission replication, then restart Outlook.
3. Manually add the shared mailbox in account settings if automapping fails.
4. Review whether AutoMapping was disabled when permissions were assigned.

Technician Notes

Confirm the business impact, document the root cause, and capture any preventative follow-up in the PSA or client knowledge base.