Twilio has detected that this WhatsApp message was sent using the currently EOL Legacy WhatsApp templates system.
Changes are required to how you send templates over WhatsApp by April 1, 2025. Templates must be created and managed using the Content Template Builder or Content API. Templates must be sent using ContentSid and Content Variables.
For more information please see this support article: https://help.twilio.com/articles/19816296822299
Template sent using body field.
Templates must be sent using ContentSid and Content Variables