What does HRESULT 0x800C000C (INET_E_INVALID_REQUEST) mean?

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The Internet request is invalid or was not understood.

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INET_E_CONNECTION_TIMEOUT	INET_E_UNKNOWN_PROTOCOL

INET_E_INVALID_REQUEST

INET_E_INVALID_REQUEST is a URL Moniker HRESULT. It means that the target server or protocol handler rejected the request syntax, method, headers, body or other request parameters. It can correspond to a malformed client request rather than a connectivity problem.

What to check

Inspect the request method, URL, headers and body against the target protocol requirements.
Capture the safe portion of the server response or status code that explains the rejection.
Verify encoding, content length, content type and request sequencing for the API in use.

Microsoft documentation

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