The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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=fgDSHn0e3kyomIOBqWzTCMb0c4CGM5hOiAsGwMXUokBUQkhHSVIzNk1FTkoySzVMWk9ISjNaNERUVS4u&web=1&wdLOR=c0D489362-C1EB-5841-9C88-D7BA9CD73608