We once were on the Emerald, and all pax (B2B also) had to stay off the ship until 1pm and unable to get to cabins until 3pm...security was making sure that no one entered. They were doing a deep clean for noro.
Have already done final payment for the Oct 15 cruise on the Regal but Princess has said that the FCC will appear as a credit on the card that we used for the payment.