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When travelling with the ICE from/to Zurich from/to Germany, I always get asked to show my ticket despite having used Komfort Check-In in the DB App. When will Komfort Check-In https://www.bahn.de/service/zug/komfortcheckin be rolled out in Switzerland?
Unfortunately, I can't tell you if such a feature will be extended on the SBB App. All information about our Mobile APP can be found here: SBB Mobile | SBB