Cannot Add Card because of "Card Device Limit"
My bank finally turned on Apple Pay this morning, I have added my Visa card successfully, but I can't add my American Express card. Initially, I was able to add the AMEX card to my phone, but when I added it to the watch I got "Card Device Limit - This card cannot be added until it is removed from one of the other devices that is using it". When I tried deleting the card from my phone and starting the process again, I get the same error adding to my phone. This card registered with my apple ID, but its only being used on 4 devices. Why can't I add this card?
iPhone 6, iOS 9.3.1