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HTTP 400: Invalid request. Retrying the same request gives the same error. Errors never cost API credits. The detail says what is wrong. An unknown fields path lists the valid paths in valid_fields, and an unknown expand value lists the accepted ones in valid_expand. What to do: Fix the request as the detail says, then send it again.
Response
The response is application/problem+json (RFC 9457) and has a Request-Id header with the same request_id. See all errors.