What does HRESULT 0x800F0209 (SPAPI_E_INVALID_REG_PROPERTY) mean?

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Description:

The requested SetupAPI registry property code is invalid. Use a property identifier valid for the selected device or class API.

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SPAPI_E_DEVINFO_NOT_REGISTERED	SPAPI_E_NO_INF

SPAPI_E_INVALID_REG_PROPERTY

SPAPI_E_INVALID_REG_PROPERTY means that the caller supplied a registry-property code SetupAPI does not recognize for the requested operation. Device, class, and interface properties have different APIs and identifiers; using an identifier in the wrong family can lead to this failure.

What to check

Confirm which SetupDi property API is being called and use identifiers documented for that API.
Check that the property is supported for the selected object type: device, setup class, or device interface.
Validate casts and constants when code shares a generic property wrapper across several APIs.

Microsoft: SetupAPI property functions

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