The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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://cdn.pfizer.com/pfizercom/2021-07/Delta_Variant_Study_Press_Statement_Final_7.8.21.pdf?IPpR1xZjlwvaUMQ9sRn2FkePcBiRPGqw