Hi @SimoCanc 
the error says that Twilio can’t find the From number you are providing. Can you confirm that your From number is valid? Also, do you have Business Profile with Whatsapp within Twilio or are you using the Whatsapp Sandbox?
Hi @SimoCanc the error says that Twilio can’t find the From number you are providing. Can you confirm that your From number is valid? Also, do you have Business Profile with Whatsapp within Twilio or are you using the Whatsapp Sandbox?