What does HRESULT 0x803D0000 (WS_E_INVALID_FORMAT) mean?

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Windows Web Services received data in an unexpected format or with an invalid value.

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SDIAG_E_ROOTCAUSE	WS_E_OBJECT_FAULTED

WS_E_INVALID_FORMAT

WS_E_INVALID_FORMAT is a Windows Web Services API HRESULT. It means that the Windows Web Services API could not parse or accept the supplied XML, message content, endpoint data, or another input value in the expected representation.

What to check

Validate the message structure, namespaces, element order and value encoding against the service contract.
Check the endpoint URL, headers and serialization settings used by the client and service.
Keep a safe copy of the failing payload or a redacted trace so the exact parsing point can be identified.

Microsoft documentation

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