The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.
https://docs.google.com/forms/d/e/1FAIpQLSdXkc-sVcABlsobBCj0lbZphS0CwuEkKT8sWVW4AErHc7mj7w/viewform