Sorry, let me be more specific:
in https://www.sbb.ch/en/travelcards-and-tickets/railpasses/half-fare-travelcard.html
I click purchase -> (for the 185chf choice)
Then, on the tab
Travelcard holder
For whom would you like to purchase a travelcard?
I click my data, which include my name, my adress, my postal code, the city I live in.
Lastly, i click on I’m not a robot, and hit continue –>.
This is when I’m transfered into a banl page, and i cannot continue with the purchase.