I can’t add a credit card to my Apple ID. Why not?

Is your Apple ID disabled?

See If you see a message 'Your account has been disabled in the App Store and iTunes' https://support.apple.com/en-us/HT208856. This link says: "There might be a problem with the payment method that you have on file. When you see the message, don't try to edit any of your account information. Instead, contact Apple Support for help.”

Try using the Apple recommended support link above first. But, this site is down/not fully functional very often. Use the support options I give below if necessary.

You can use Apple Support Twitter https://twitter.com/AppleSupport  There may be a wait of an hour or so.

And, if necessary, go here to contact iTunes worldwide support via text or chat https://support.apple.com/choose-country-region/itunes After choosing your country, see the heading, Tell us how we can help.

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Has your payment method been declined?

See If your payment method is declined in the App Store or iTunes Store https://support.apple.com/en-us/HT203005. To resolve this, add a new payment method or update the billing information for your current payment method.

If you need additional help, use this support link from the document https://support.apple.com/contact  or use:

Apple telephonesupport https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362 Be patient sometimes Apple support is closed to immediate phone support.

Apple Support Twitter https://twitter.com/AppleSupport There may be an hour or so wait.

iTunes worldwide support via text or chat using this link https://support.apple.com/choose-country-region/itunes After choosing your country, see the heading Tell us how we can help.

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Also see: Fix ‘Your Payment Method Was Declined’ Error In App Store https://www.addictivetips.com/ios/fix-your-payment-method-was-declined-error-in-app-store/. If you need more help here, use the support links above.