I have been trying to book dining times. Apparently this can only be done after the final payment is made for the cruise, but at the moment, the Medallion app seems to be 'down', or at least the Dine My Way part isn't working properly. I have three Princess cruises booked and when I try to access the January one to book dining times, the Medallion app opens my June cruise every time I try.😠 I will phone Princess tomorrow and see if they can get it to work.