This is the fourth time we're trying to do a Rhine river cruise next year (hopefully Covid will be gone by then). I'm trying to book to business saver award tickets, the advanced mode shows JN9 and ZN1. Now we're United Chase credit card members and AFAIK it used to be that gave you access to the JN inventory but when I try to book two tickets it will only allow 1. Have the rules changed, I did a search and don't see anything that says the Chase United card doesn't get you into the JN inventory. Thanks