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TAPI_E_INVALLIST
The TAPI list argument does not satisfy the method contract
TAPI_E_INVALLIST (0x8004001E) means an array/list structure provided by the application cannot be accepted. This is local/provider input validation, not evidence that every referenced telephony object is unavailable.
Evidence to capture
Record method, list type, element count, each element identifier/type, null entries, structure sizes, and provider version.
Focused correction
Construct the list from current provider-enumerated objects and documented element types. If one target is missing after the list is valid, preserve the target-specific HRESULT.
Technical references
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