HRESULT 0x800F0206 (SPAPI_E_INVALID_CLASS): meaning and diagnosis

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Description:

The requested device setup class is missing or invalid. Use a registered Class and ClassGuid pair appropriate for the device.

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SPAPI_E_INVALID_DEVINST_NAME	SPAPI_E_DEVINST_ALREADY_EXISTS

SPAPI_E_INVALID_CLASS

SPAPI_E_INVALID_CLASS means that SetupAPI could not resolve the installation class named by the caller or INF. The problem can be a missing registry class, an invalid GUID, or a Class and ClassGuid pair that does not describe the same device setup class.

What to check

Validate the ClassGuid syntax and confirm that the Class name is correct for the intended device category.
Use a system-defined class where it applies instead of inventing a near-equivalent category.
Check the INF Version section and the caller-supplied class GUID for inconsistent values.

Microsoft: system-defined device setup classes

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