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 discriminator: Verify whether the notification was successfully posted before the hide or follow-up operation. This result means the required posted state was never reached.

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