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TAPI_E_INVALFEATURE
The feature argument is not accepted
TAPI_E_INVALFEATURE (0x8004002C) means the caller supplied a feature value that is undefined or unsupported for the method/object. This is parameter/capability validation rather than a transient call-state problem.
Evidence to capture
Record feature ID/flags, method, object type, provider capabilities, TAPI version, and any enum translation performed by wrappers.
Focused correction
Use a feature explicitly advertised/supported for the current provider and object. If the feature is valid but unavailable in the current state, preserve the state-specific HRESULT.
Technical references
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