What does HRESULT 0x80190196 (HTTP_E_STATUS_NONE_ACCEPTABLE) mean?

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The server returned HTTP 406 Not Acceptable because no acceptable representation could be selected.

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HTTP_E_STATUS_BAD_METHOD	HTTP_E_STATUS_PROXY_AUTH_REQ

HTTP_E_STATUS_NONE_ACCEPTABLE

HTTP_E_STATUS_NONE_ACCEPTABLE maps to HTTP 406 Not Acceptable. The server could not produce a representation acceptable under the proactive content-negotiation headers sent by the client.

Diagnostic discriminator: Repeat the same request while changing only the Accept-family negotiation headers. If the server returns a representation after that change, the failure is content negotiation; DNS, TLS, and generic transport retries are not the corrective boundary.

What to check for HTTP_E_STATUS_NONE_ACCEPTABLE

Review Accept, Accept-Language, Accept-Encoding, and any custom negotiation headers.
Confirm that the client permits a media type and character set the endpoint actually serves.
Check whether an API gateway rewrites or narrows the request headers before they reach the application.

RFC 9110: 406 Not Acceptable

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