idempotency_key_reused

This Idempotency-Key was used for a different order, account or batch; this request was not sent.

HTTP 409, 422. Nothing reached the broker.

Likely cause: A key was reused for a new request.

What to do: Use a new key; the earlier request stands.

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

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