You'll have to wait until the trains are opened for booking. The booking window is often shorter around the annual timetable change, which is on the Sunday after the 2nd Saturday in December. No need to worry though. Reservations for the day trains are optional (regardless of what the app or website claim) and are unlikely to be fully booked such a long time in advance. Ok I just thought it was weird seeing that the trains are available to book on the DB site but not through Eurail.
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