# E12056 — SMSSenderNotConfigured

This sender is not one of your configured SMS senders.

- **HTTP status**: `422`
- **Type**: `validation_error`
- **Name**: `SMSSenderNotConfigured`

## What to do

Add the sender under SMS senders before sending from it, then register it for any destination country that requires a registration. Sending from a sender you have not configured is no longer permitted.

## Related

- [E12xxx — SMS sending & delivery](/docs/api/errors/E12xxx): every code in this range
- [Errors](/docs/api/errors): the full wire contract, status mapping, and error catalog
- [Error handling](/docs/guides/errors): branching on `type` and `code`, validation details, and `vendor_code`