HRESULT 0x803E0108 (WPN_E_NOTIFICATION_NOT

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WPN_E_NOTIFICATION_NOT_POSTED means that Windows cannot hide a notification that has not been shown.

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WPN_E_NOTIFICATION_HIDDEN	WPN_E_CLOUD_DISABLED

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.

Microsoft documentation

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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