Hey - we just got our docs for the same cruise, also a group. Here's what I found:
On the cover of the docs, where it says Booking No. - this is the GROUP booking number.
Inside the docs, on the Funpass page - this is where your INDIVIDUAL booking number appears.
If you enter your group number in the online funpass area, or whatever, it won't recognize it. Use your individual number.
Hope that helps! See you on the Conquest!