# E15018 — WhatsAppSenderNotAllowed

This message's sender is already determined, so from cannot be set.

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

## What to do

Remove from. A Bird-managed template selects its own sender from its category, and a Bird-managed number is routed by Bird.

## Related

- [E15xxx — WhatsApp sending & delivery](/docs/api/errors/E15xxx): 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`