Hello Houquieka17
God dag 🙂
We are not the SBB 😉 But as a customer support forum run by volunteers, we can help, though.
We will check the situation with SBB (POSP CS010782410). Because of the modified timetable, the ticketing system seems to be confused. We will be back.
You could purchase a point-to-point 1st class upgrade ticket at ½ fare with the train attendant as well. There won’t be any Supersaver class upgrade tickets offers on this route anyway.
Kind regards,
Roland