WPN_E_OUTSTANDING_CHANNEL_REQUEST: meaning and diagnosis

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WPN_E_OUTSTANDING_CHANNEL_REQUEST: A notification channel request for the provided application identifier is in progress.

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WPN_E_INVALID_APP	WPN_E_DUPLICATE_CHANNEL

WPN_E_OUTSTANDING_CHANNEL_REQUEST

WPN_E_OUTSTANDING_CHANNEL_REQUEST is an HRESULT used by the Windows notification platform. It means that another request for a notification channel is still pending for the same application identifier.

What to check for WPN_E_OUTSTANDING_CHANNEL_REQUEST

Await or share the in-flight request instead of initiating a duplicate channel request.
Serialize channel refresh logic across startup, background activation, and user-sign-in paths.
Persist and reuse an unexpired channel where the API and application design permit it.

Microsoft documentation

Diagnostic discriminator: Trace channel requests for the same application identifier and verify that the previous request has completed. The conflict is an outstanding channel operation, not an invalid package identity.

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