WhatsApp error 131045
Error 131045: Number registration error
Error 131045 means the sending phone number is not properly registered for the Cloud API, so Meta will not send from it. Register the number, with its two-step verification PIN, then send again.
- Meta’s description
- “Message failed to send due to a phone number registration error.” Meta’s error codes, 5 October 2026
- Charged by Meta?
- No. Meta charges only for delivered messages, and this one was not delivered.
Common causes
- The number was added to the account but never registered for the Cloud API.
- Registration was started but did not finish.
How to fix it
- Register the number for the Cloud API, using its two-step verification PIN, then retry.
What Fliok does about it
- Fliok raises one urgent alert for the workspace, “WhatsApp number not registered”, instead of one per failed message. While it is unread it is raised again at most once a day.
- Complete the number’s registration in Settings.
Meta sets and changes these codes. If anything here disagrees with Meta’s current reference, Meta is right.
Both say the number is not registered. 131045 comes back on a message you tried to send; 133010 comes back on other requests for an unregistered number. The fix is the same: register it.
Related codes
Other errors you may see
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