Why do I keep getting the security code invalid message when trying to change my credit card info. Being trying to get this right for 3 days

My old credit card expired so I'm putting in new information but I keep getting this message security code invalid.  Why?

Hi BT54,
Thanks for using Apple Support Communities. Based on what you stated, I'm not sure if this is causing the issue but it is a possible cause. I would recommend that you read this article, it may be able to help the issue.
Payment methods you can use in the iTunes Store, Mac App Store, App Store, and iBooks Store - Apple Support
If you create an account for a child under 13* in Family Sharing, you must use a credit card as the payment method. After you create the child’s Apple ID, however, you can change your payment method back to a debit card.
Cheers,
Mario

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