The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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/TfN8WqTYPCVKBCFhuELw-A~~/AAAAAQA~/RgRnORcWP0RHaHR0cHM6Ly93d3cudGFsYXdhbmRhLm9yZy9kZXBhcnRtZW50cy90cmFuc3BvcnRhdGlvbi00MS9idXMtcm91dGVzLTQ0MC9XB3NjaG9vbG1CCmVVluNXZR_wYXBSE21lcnpqQHRhbGF3YW5kYS5vcmdYBAAAAAE~