I am trying to buy a simple TO/FROM train ticket (Zurich airport to Lauterbrunnen). The Deutsche Bahn web site that Rick Steves suggests (www.bahn.de) is really excellent. HOWEVER, when I get to the last screen it says «We are sorry but we cannot sell your requested journey online». So then I click on how to book an online ticket. It says «1. Find the connection you want on bahn.com». This works. Then it says «2. Got to «Ticket & Reservation» and select the Digital ticket. The problem is that the «Ticket & Reservation» tab/option is not available (does not become dark and «selectable»; I can't click on it). I even switched from Internet Exporer to Chrome, thinking this might be the issue. But is still is not an option I can click on.
If anyone has hints or advice, that would be useful. Many thanks!