The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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://gc.synxis.com/rez.aspx?Chain=5157&template=FLEXNDP&shell=FLEX&hotel=56925&arrive=11/12/2018&depart=11/14/2018&adult=1&child=0&group=1106STAINL