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WPN_E_NOTIFICATION_NOT_POSTED
WPN_E_NOTIFICATION_NOT_POSTED is an HRESULT used by the Windows notification platform. It means that the application tried to hide or otherwise act on a notification before it was posted.
What to check for WPN_E_NOTIFICATION_NOT_POSTED
- Verify the order of notification creation, posting, update, and hide operations.
- Handle cancelled or failed posting paths before issuing a follow-up hide operation.
- Avoid using local UI state alone as proof that the platform posted the notification.
Diagnostic interpretation
This result has the HRESULT value 0x803E0108. AllStat records the condition as “The notification cannot be hidden until it has been shown.”.
Evidence to capture
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the wpn / notification / posted operation.
- compare the failing machine with a working one at the same configuration boundary: component version, policy, registration, identity, and target resource.
Retry and recovery
Before repeating the call, correct the state that produced WPN_E_NOTIFICATION_NOT_POSTED. Verify the repair with the same inputs and observation points rather than with a broader reset.
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