# E12019 — SMSAlphaRegistrationRequired

Alphanumeric senders require registration for the destination country. Register a sender for this country before sending.

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

## What to do

Register an alphanumeric sender for the destination country, then send again once it is approved.

## 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`