I was just able to take advantage of the non-expiring FCC issued from my March 2020 Cruise with Confidence cancellation. Due to the original expiration date we had booked a cruise for last December. Royal cancelled all of their Mariner sailings and everybody had to rebook. Anyway, we rebooked and sailed in January 2022 but didn't use up the FCC. I was able to call Royal and apply the unused FCC balance to a booking for October 2022, but in addition, my sister was allowed to transfer her FCC to me, since I'll be in a solo cabin in October. So glad to be able to use that remaining $277 rather than lose it.