The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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/1CuYBCTPJCu3cCzkgAjrjcVk5UkhMnP8N0GU5d_GC1iE/edit?ts=5f996105&gxids=7628