“Meta delivery is unavailable” usually means WABotSender could not make an authorised Cloud API request.

Check in this order

  1. Confirm the computer can reach graph.facebook.com over HTTPS.
  2. Verify the access token is current and belongs to the correct Meta app or system user.
  3. Confirm WhatsApp management and messaging permissions.
  4. Confirm the system user has access to the WABA and phone-number asset.
  5. Verify the WABA ID and Phone Number ID were not swapped.
  6. Reconnect the account and run the test again.

Common codes

190 indicates an invalid or expired access token. 10 indicates missing permission. Never solve either by sharing credentials with support.