The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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.healthpoint.co.nz/covid-19/?fbclid=IwAR1jxjIgu-pI1Wnur7OProZwRKAGKXK4dZrl1up0fa5qpYuXeSiHUMDZIm4