A phone number must belong to the intended WhatsApp Business Platform account before Cloud API can send from it.

If Meta says the number is already registered

The phone number is attached to an existing WhatsApp or WhatsApp Business account. Follow Meta’s migration or disconnect flow, wait for the number to refresh, then try again. Removing an account can affect message history and access, so review Meta’s instructions before continuing.

After registration

  1. Confirm the number shows as connected in WhatsApp Manager.
  2. Copy the Phone Number ID, not the displayed phone number.
  3. Update the account in WABotSender.
  4. Send a test message to an eligible recipient.

Common registration codes

133010 means the number is not registered for Cloud API. 133016 means too many registration attempts were made; stop retrying and wait.