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General Microsoft Entra architecture, operations, and identity platform articles.
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Your user has Full Access to a shared mailbox but it isn't appearing in Outlook. Walk the five-step diagnostic — auto-mapping, replication, profile cache, mailbox type, and manual add — and fix the underlying cause, not the symptom.
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The user clicks the shared mailbox and Outlook says 'You don't have permission.' Walk the access-flag hierarchy, deny-permission precedence, ACL inheritance, and the licensing trap that produces the same error message.
Send As is granted, propagation has completed, the user still gets 'The message could not be sent.' Walk the difference between Send As and Send on Behalf, the auto-complete cache that breaks new addresses, the From-field display rule, and the 60-minute permission-cache window.
Members were added but mail isn't reaching them. Dynamic group filter was changed but the group looks the same. Walk the three sync clocks (Entra Connect, EXO directory, EXO recipient cache) and the filter scope gotchas that produce these failures.
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