Guess what? Same thing is happening again.   Even though I just had a problem with this when canceling another excursion booked with gift cards, I decided to cancel my "Paris On Your Own" excursion (costing $600 for 4 of us) because I wanted to book the Mt St. Michel excursion.  (I literally waited from September to March to book the Mt St. Michel excursion because I have been wanting to take it since my 2021 cruise was canceled and I had it booked as an excursion, but when it never sh