I asked customer service eurail b.v.  the “passcover numbers” of our mobile interrail passes.  I didn't get it because I didn't mention a specific reservation.  I see in the forum that many request this under time pressure.  I also know that it is only necessary with a limited type of reservations.  To avoid that stress, I already requested the passcover numbers for our three-month interrail passes, which we will probably use in a few months.  That you need a specific reservation question to get these numbers: is that new or has it always been the case?