@Ncattell
It's a glitch in the website if you have your card details saved and use autofill.
You need to enter the Amex Card number manually then it should work also you should see a Amex icon next to the number. If the card number is auto-filled then the CVV only allows up to 3 digits.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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