The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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/1FAIpQLScgp4PhWALcrhfXWjprFfjfu74QGifHnO8HFLYWBZs-AFqz8A/viewform?usp=sf_link