Cannot add existing card for Apple Pay to wallet on new iPhone
I already have a card on my account, I can see all the information about it on my iPad. When I try and add it to the wallet on my new iPhone 12 Pro Max (on the same Apple ID) it knows the card, asks for the CVV then I get the error message "Card Not Added, Contact your card issuer for more information."
I don't think I need to contact them, as the card is already set up for apple pay, it was on my iPhone X, Apple Watch and still is working on my iPad.
I have checked the region settings, signed out and back in with my Apple ID and a few other suggestions to no avail.
Does anybody know how to fix this please?
iPhone 12 Pro Max, iOS 14