TX_OPTIONS_UNSUPPORTED

The transaction options field has a bit CoRelayer does not relay.

HTTP status	400
Group	Relay path
Retryable	No — sending it again changes nothing
Re-sign	NONE — do not ask the user to sign anything

What happened

Only the option bits documented for relayed v3 (including the guarded bit) are accepted.

What to do

Clear the unsupported bits, rebuild and sign again.

The problem document

Every error is application/problem+json (RFC 9457) with the same shape:

{
  "type": "https://docs.co-relayer.com/errors/tx-options-unsupported",
  "title": "The transaction `options` field has a bit CoRelayer does not relay.",
  "status": 400,
  "detail": "A sentence about this specific occurrence.",
  "instance": "req_01JB…",
  "code": "TX_OPTIONS_UNSUPPORTED",
  "retryable": false,
  "resign": "NONE",
  "hint": "Clear the unsupported bits, rebuild and sign again."
}

See the error model for what each member means and how to handle unknown codes.