I would recommend you a bag around 60/65l, otherwise you take to much stuff/weight with you. And less is not enough for taking warm clothes with you.
Could you add the journey Amsterdam - Zürich to your pass when you first tried? It should warn you about an inbound/outbound journey. On the other hand, if it doesn't use an inbound/outbound journey (did you check in My Pass after adding it?), then it's a bug but you could take advantage of it... I could and I checked My Pass then saying "Not valid in Germany". Now that's away with the trick I did.
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