What does HRESULT 0x803E0104 (WPN_E_DUPLICATE_CHANNEL) mean?

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WPN_E_DUPLICATE_CHANNEL: The channel identifier is already tied to another application endpoint.

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WPN_E_OUTSTANDING_CHANNEL_REQUEST	WPN_E_PLATFORM_UNAVAILABLE

WPN_E_DUPLICATE_CHANNEL

WPN_E_DUPLICATE_CHANNEL is an HRESULT used by the Windows notification platform. It means that the platform found an existing association for the channel identifier that conflicts with the requested application endpoint.

What to check for WPN_E_DUPLICATE_CHANNEL

Check whether a stale app registration, reinstall, or backend record is reusing the channel identifier.
Register the channel only for its intended package and application endpoint.
Remove obsolete backend registrations only after confirming that they are no longer used.

Microsoft documentation

Diagnostic discriminator: Compare the requested channel identity with channels already registered for the package. An existing equivalent channel distinguishes this result from channel-creation transport or authentication failures.

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