RELAYER_SHARD_MISMATCH

The relayer is not in the sender’s shard.

HTTP status	422
Group	Relay path
Retryable	No — sending it again changes nothing
Re-sign	NONE — do not ask the user to sign anything

What happened

Relayed v3 requires the relayer and the sender to live in the same shard.

What to do

Assign again for this sender; assignment always picks a relayer in the right shard.

The problem document

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

{
  "type": "https://docs.co-relayer.com/errors/relayer-shard-mismatch",
  "title": "The relayer is not in the sender’s shard.",
  "status": 422,
  "detail": "A sentence about this specific occurrence.",
  "instance": "req_01JB…",
  "code": "RELAYER_SHARD_MISMATCH",
  "retryable": false,
  "resign": "NONE",
  "hint": "Assign again for this sender; assignment always picks a relayer in the right shard."
}

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