4004: Pinned line unsendable.
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
Section titled “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.