HRESULT 0x803E0107 (WPN_E_NOTIFICATION

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WPN_E_NOTIFICATION_HIDDEN means that the local Windows notification has already been hidden.

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WPN_E_NOTIFICATION_POSTED	WPN_E_NOTIFICATION_NOT_POSTED

WPN_E_NOTIFICATION_HIDDEN

WPN_E_NOTIFICATION_HIDDEN is an HRESULT used by the Windows notification platform. It means that code attempted a state transition that is invalid after the notification was already hidden.

What to check for WPN_E_NOTIFICATION_HIDDEN

Ensure hide or dismiss logic is idempotent and does not run twice for the same notification.
Track application state separately from the platform notification object lifetime.
Create a new notification when a new presentation is required rather than reusing a hidden instance.

Microsoft documentation

Diagnostic interpretation

This result has the HRESULT value 0x803E0107. AllStat records the condition as “The notification has already been hidden.”.

Evidence to capture

Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the wpn / notification / hidden operation.
Preserve the first failure in the call chain; a later HRESULT can describe cleanup rather than the original wpn / notification / hidden condition.

Retry and recovery

Retry only after the condition responsible for WPN_E_NOTIFICATION_HIDDEN has changed; repeat the same operation and confirm that the original failure boundary has moved or disappeared.

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