# E12069 — SMSKeywordMandatedOperation

One of these keywords must keep the operation carriers require of it.

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

## What to do

Bind the keyword to the operation it already has, or choose a different keyword. Opt-out keywords always unsubscribe the sender and opt-in keywords always resubscribe them, whichever rule matched, because carriers and regulators require it. You can still change the reply.

## 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`