I need to purchase a (return) ticket to Germany on sbb.ch. Having selected the connections and reservation preferences for both legs of the journey, I finally push the “Zur Kasse” button. After a longish pause, I get the message “Warenkorb nicht gefunden! … Bitte wählen Sie zuerst ein Produkt oder eine Verbindung …”. Been through the whole exercise several times now. Browser is Firefox 123.0.1 (64-bit). I do not want to install a different browser.