Once a year, customers who have a GA travelcard receive a so-called “Mitfahrkarte”. To do this, the authorisation for advertising purposes must be activated in your settings. If you believe that you are entitled to this travelcard but have not yet received it, the best thing you can do is contact the hotline. 0848 446 688
Sometimes there are also special promotions where you can buy such a card, it is best to subscribe to the newsletter, then you will be informed directly when there is another promotion.
Otherwise there is unfortunately no discount. A normal ticket must be purchased.
Alternatively, there is also the Friends Day Pass for Youth. This allows up to 4 people under 25 to travel together for a whole day for 80 francs.