The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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/1FAIpQLSfIU_t0O-_LyTJk89L-X4HLsxkmMIyJUDm0CRsFfsmYgYwK6A/viewform