The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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://el2.convertkit-mail.com/c/75unneo96h8h02ge5uz/xwiph3upwqnneo/aHR0cHM6Ly93d3cudGhlLWJlYXR5YXJkLmNvbS9jb21tdW5pdHkv