You can change the reduction under «My Settings» and «Travelers» or in the step «Ticket Option» during the purchase. Please click on «Edit travelers».
The reduced price is not automatically calculated even if the SwissPass is registered in the app SBB Mobile.
Please fill out this form to request the refund of your ticket: Refund of tickets purchased online and via mobile | SBB help & contact
I wish you an excellent Sunday.