The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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://clinicalinfo.hiv.gov/en/drugs/cabotegravir-1/patient#:~:text=Long%2Dacting%20injectable%20cabotegravir%20for%20HIV%20PrEP%20will%20be%20administered,one%20time%20every%202%20months