The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.
http://track.spe.schoolmessenger.com/f/a/Q6FZYLzkGP2Nv5ems9nosw~~/AAAAAQA~/RgRm3HxoP0Q4aHR0cHM6Ly93d3cuY29sbGVnZWZhaXJndWlkZS5jb20vY2luY2lubmF0aS1jb2xsZWdlLWZhaXJXB3NjaG9vbG1CCmT56Ej7ZOKfeR9SIXNvbW1lci5icmFkZHNAd2FycmVuY291bnR5ZXNjLmNvbVgEAAAAAQ~~