We are doing our 3rd B2B in January 2023 on the Breakaway out of NOLA. I strongly recommend calling NCL in advance to make sure your reservations are “linked in their system “. Our first experience, I just assumed they were linked, but they were not. This led to multiple problems and 5 trips to guest services on the first day. Our new key cards didn’t work to get in the cabin. Our dining package we bought wasn’t transferred to the second leg, etc. We had to change cabins. The second experience was much better (same cabin), but I had to follow up with calls to NCL three times to make sure they were linked (first 2 calls they weren’t). Third call was 1 week before embarkation and they were linked. First leg went perfectly, tested negative for covid on last sea day (Bliss Lounge)before arriving back in NOLA and new key cards opened door to our room, but it couldn’t use key card to get drinks. Had to get new key cards issued at Guest Services, but that was the only small hiccup. So you can avoid some of the problems by calling ahead to make sure the reservations are linked. Now we are hooked and 7 days are just not long enough, but 14 days is perfect.