The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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://webmail.nzta.govt.nz/owa/redir.aspx?REF=JZj6LfzTjHGJMPxIoTEG0HcSO7XLsLbLc6OYrE-UbBFAcZNP7W7TCAFodHRwOi8vd3d3LmRyaXZlbGl2ZS5uei9CYXlvZlBsZW50eQ