What does HRESULT 0x803E0107 (WPN_E_NOTIFICATION_HIDDEN) mean?

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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 discriminator: Verify the notification lifecycle before the failing call. This result indicates an operation was attempted after the notification had already entered the hidden state, so changing payload content is not the relevant test.

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