You don’t register with TeleCare. Your local Audi who sold you the $6000+ hearing aids registers with TeleCare. Then when you ask for adjustments to your hearing aid programming your Audi can setup the changes using Connexx and automatically sync the changes with the TeleCare portal. You can even do it with Skype-like video conferencing with your Audi.
Your chances of getting remote adjustments are remote (get the pun?) unless you have paid big bucks in order to subsidize the effort required of your Audi to setup TeleCare.
https://pro.signiausa.com/scientific_marketing/how-to-perform-remote-fine-tuning-tc3/