I apologize for another COVID question, however, I am trying to fill out our PLF for our trip of Belgium/Amsterdam. We booked tickets early for Amsterdam to Bruges that are intercity, which I believe means we don't have a train number on our ticket (I will be honest its very confusing reading the ticket and seeing what the different numbers are for). If we don't have a train number to put on the PLF what would you recommend putting? Should we cancel our tickets and get one through a different company so we have a number for the PLF. I apologize for all the questions we are just trying to have everything taken care of before our trip!
I guess the other question would be how far in advance would we need to fill it out? Could we fill out our PLF while on the train from Amsterdam?