Not the first time!
One time I made the mistake of attempting to use apps instead of paper for a vacation.
The airline app worked fine the night before our trip, but next afternoon at the checkin counter, it wanted me to change my password. Luckily we had our bags there and the paper versions of the paperless tickets were easily extracted and we got our flights.
The app for a well-known theme park worked fine at the hotel the night before, but next morning when we got to the entrance whaddya know? It wanted me to change my password. Unluckily, the paper versions of the paperless tickets were back at the hotel, and to fetch them the fittest parent (not me) took 25 minutes round trip, also known as "the time it takes for the line at a well-known theme park to grow from a few hundred people to a few thousand" so we missed the first hour or so of the "early bird" stuff.
Next time we went, we just used the paper versions of the paperless tickets. Which are all bigger and use about four times as much paper compared to the old paper tickets that the paperless tickets were supposed to replace.