---
title: 4004: Pinned line unsendable. | API Docs
description: This conversation's pinned number can no longer send.
---

**HTTP status:** `422`.

The number this conversation already uses is no longer a registered sending number of yours. Nothing was sent, no chat was forked and the pin was not moved.

## Troubleshooting

- Read error.context.pinned\_from (the current number, absent when it is no longer yours) and error.context.available\_from (a number that could serve instead).
- Open a new conversation by sending an approved template with from set to available\_from.

## Related

- [Phone numbers guide](/channel/whatsapp/guides/phone-numbers/index.md)
- [Sending a message](/channel/whatsapp/api/resources/chats/subresources/messages/methods/send/index.md)