I am booked on a Gty 4A. I have my sail&sign account card in front of me. I am looking on the back and see my booking number followed immediately by TBA18CQ2004062 then a bunch of zeros and a 7. I guessed that perhaps my cabin is 4062??? But tried to buy something and it said invalid room number. USing the Kelly Method would the TBA be the room number?? But in my case it is TBA? So i can't figure out my cabin number with the Kelly Method. thanks for your insight.