Just done it, the last 4 digits are different for each member of my partyThere's a trick to figure out your cabin after you check in. I didn't think they assigned anything until then, which is 45 days from sailing. At that point, add your pass to your Apple Wallet and look at the numbers under the barcode, or scan the barcode with google lens(?) or whatever will read the barcode. The last four digits are your room number.