Search for poster CVJW. She and her hubby did a B2B last month and spoke about it.
Here is what she reported about her B2B
We did 2 last week. We got a note in the app from guest services to meet in pub 687 at 9:15 on embarkation day. We did. A cast member came around and verified our names and staterooms. Once all other passengers were off the ship (it took a while - They kept calling for random families to leave the ship) we were escorted off as a big group.
We went thru customs. It was a breeze. They were waiting for us. Then the cast member led us to the terminal and we sat as a group and waited. We all did have to go to the check in counter to show our safe passage QR code’s and online checkin form for the second cruise.
After about an hour, they led us back onto the ship. They did not tell us where we could go. I finally asked and they told us to go to cove cafe. They had free food and coffee for us. I checked our stateroom, but the main doors were closed. We went to deck 13 and then to cabanas. Then the staterooms were ready. Easy process. Probably took about 3 hours from meeting in the pub to back on the ship.
Hope this helps,
glen