NTSTATUS 0xC0350009 (STATUS_HV_UNKNOWN

Status / error code:

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Description:

The supplied Hyper-V partition property identifier is not recognized by this hypervisor interface.

Could be also:
Constant	Type	OS
ERROR_HV_UNKNOWN_PROPERTY	HRESULT	Windows

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STATUS_HV_OPERATION_DENIED	STATUS_HV_PROPERTY_VALUE_OUT_OF_RANGE

STATUS_HV_UNKNOWN_PROPERTY

The property selector is not part of the exposed property set

STATUS_HV_UNKNOWN_PROPERTY means the hypervisor does not recognize the requested partition property code. This is more specific than an out-of-range value: the selector itself is unknown to the implementation or interface made visible to the caller.

Check the guest-visible Hyper-V interface and the exact property enumeration used by the host-management component. A newer property definition in headers does not guarantee that an older host, a nested implementation, or a third-party HV#1-compatible hypervisor exposes it. Compatibility decisions should use documented feature discovery, not an assumed host version.

Useful comparison points

The numeric property code emitted by the caller and the header/specification revision that defined it.
The Hyper-V interface signature and partition feature data reported at runtime.
Whether the request crosses a nested virtualization boundary.
Fallback behavior for an unsupported property versus a failed property update.

References

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