api_version_unsupported

The API version to pin is older than the oldest supported version.

HTTP 400.

Likely cause: The version is past its sunset, or predates every published version.

What to do: Pin one of metadata.supportedVersions. The pin was not changed.

Retry: No. The same request gets the same answer; change something first.

Listed under Requests and validation in Errors. Send the error’s requestId to support and we can find the request.