HRESULT 0x803E0106 (WPN_E_NOTIFICATION

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WPN_E_NOTIFICATION_POSTED means that the local Windows notification has already been posted.

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WPN_E_PLATFORM_UNAVAILABLE	WPN_E_NOTIFICATION_HIDDEN

WPN_E_NOTIFICATION_POSTED

WPN_E_NOTIFICATION_POSTED is an HRESULT used by the Windows notification platform. It means that code attempted an operation that requires an unposted notification after the notification was already shown.

What to check for WPN_E_NOTIFICATION_POSTED

Trace the notification lifecycle and avoid posting the same notification object twice.
Create or update a notification using the API sequence appropriate for its type.
Do not treat this result as confirmation that the user saw or interacted with the notification.

Microsoft documentation

Diagnostic interpretation

This result has the HRESULT value 0x803E0106. AllStat records the condition as “The notification has already been posted.”.

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.
check the documented return contract of the specific API because the same HRESULT can require different recovery in different interfaces.

Retry and recovery

Before repeating the call, correct the state that produced WPN_E_NOTIFICATION_POSTED. Verify the repair with the same inputs and observation points rather than with a broader reset.

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