The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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://www.timeanddate.com/worldclock/fixedtime.html?msg=Ask+Me+Anything+Call+on+Reproducibility+Wednesday,November+20th+at+15:00-16:00+UTC+(10:00-11:00+EDT)&iso=20191120T10&p1=3723&ah=1