LEASE_MISMATCH

The lease does not belong to this transaction.

HTTP status	409
Group	Relay path
Retryable	No — sending it again changes nothing
Re-sign	NONE — do not ask the user to sign anything

What happened

The sender or the relayer inside the signed transaction is not the pair the lease was minted for.

What to do

Assign again for the sender you are actually relaying, then sign that transaction.

The problem document

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

{
  "type": "https://docs.co-relayer.com/errors/lease-mismatch",
  "title": "The lease does not belong to this transaction.",
  "status": 409,
  "detail": "A sentence about this specific occurrence.",
  "instance": "req_01JB…",
  "code": "LEASE_MISMATCH",
  "retryable": false,
  "resign": "NONE",
  "hint": "Assign again for the sender you are actually relaying, then sign that transaction."
}

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