Hello
@hartamas,
As per Meta’s documentation, the error
(#131026) Message Undeliverable can occur if:
- The recipient number is not a valid WhatsApp number.
- The recipient has not accepted the latest WhatsApp Terms of Service & Privacy Policy.
- The recipient is using an outdated WhatsApp version (minimum supported versions: Android 2.21.15.15, iOS 2.21.170.4, KaiOS 2.2130.10, etc.).
To resolve this, kindly request the recipient to:
- Confirm they can send a WhatsApp message to your business number.
- Update their WhatsApp application to the latest version.
- Accept the latest Terms of Service in Settings > Help or Settings > Application information.
Once these steps are completed, please try sending the message again.
WhatsApp Business Platform Cloud API error codes and possible solutions.
developers.facebook.com