I have just jumped in on the LUX-MIA/BOS - BRU fare for next August that has been touted in the Premium Fares thread. I booked this and it priced into Euros. No problem. I used Avios to get the cost down to £1470 for the two of us. However when I came to pay I got the above message. I paid with my BA Amex. I had to enter this manually. When the payment cleared (and it did seems slower than usual), it told me that payment had been taken but that I could not store the card. The card is stored and has been for some considerable time. I checked when the payment cleared.

Has this occurred to anyone else and does anyone know why it did this? Why could I not use a stored card and yet pay with the exact card manually. It seems bizzare. Any advice would be gratefully received.