Because listicket service sucks. Usually servers die out when there is a big game at hand and so on...
This is really a turn-off just should handle the tickets themself but listicket is paying Juve to do so....
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Numero tessera = supporter card number
Pin = Web Ticket
promotional code= should be shopping card number. i never used it.
if you're using a international card you should select the ticket with ESTERO word in it.
after that don't forget to read "leggi le condizioni del servizio"
you have to click it to confirm
then procede with the payment and so on