i was trying to book a train from Kolding ( dk ) to Vaduz ( li ) on interrail.eu ( Vaduz train station does not exist for them ) and on bahn.de ( tere were many possible trains to choose from, but after confirming our dates of birth I got a message that I can not buy the tickets from Deutsche Bahn, but at least Vaduz station exists for them) .
We are 3 adults and a child ( 5 years old ).
Why can I not buy these tickets?
Any restriction for Danish citizens?
Kind regards Jack