The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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://forms.office.com/Pages/ResponsePage.aspx?id=kCXJRcbM-UaA_5_I2e3eOUksXj4mvmxIiRnUFe7NmplUMU1NR0xWRDZKR0U0OFdVR0EySE9DNlU3Sy4u