What does HRESULT 0x803E0106 (WPN_E_NOTIFICATION_POSTED) mean?

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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 discriminator: Check the notification state at the exact API boundary. This result means the operation required an unposted notification but the notification had already been posted.

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