Can't add test cards

I'm trying to test payments on an iOS app. I have a sandbox account and its worked previously. When I try and add a test credit card I get the error "Your Issuer Does Not Yet Offer Support For This Card" I'm using the cards here https://developer.apple.com/apple-pay/sandbox-testing/"

What I have tried:

  • Checking my Region is the UK
  • Checking the card details
  • Tried several cards
  • Tried signing out of my iCloud completely

I'm testing on an iPhone 12 mini using iOS 16.5.1

Can't add test cards
 
 
Q