The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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://zoho.email-view.com/click.zt?linkDgs=312b7d8cc5f90k166568053b2&mailDgs=312b7d8cc5f8e&ver=a78101656d9c1ed0bd939597d2d6a7c7846d05bfbe21713349bf7a42f0fcd723