# E12085 — SMSSuppressionNotRemovable

This suppression records the subscriber's own opt-out, so it cannot be removed.

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

## What to do

The subscriber texted a stop keyword to this sender. Only they can reverse it, by texting a start keyword to the same sender, so there is nothing to retry here. Suppressions you added yourself carry reason `manual` and can be ended.

## 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`