The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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/1FAIpQLSdoMiAK2OV_Z2K6fzYAnT3txhbkjcEQ9tjIJ71P3xDO-OgtkQ/viewform