I’m trying to change my credit card number with no success.

Re: " I’m trying to change my credit card number with no success: I’m unable to edit my credit card number. "

Wondering where you are trying to edit the credit card number:

Eg: In Wallet for Apple Pay, Apple Cash, Apple Card, or as a payment method for your Apple ID Account ... etc.

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For Apple ID Account: You may need to add the new card first, before you can delete the old card.

If you need to change or update your Apple ID payment method - Apple Support

Thank you for letting us know we helped, Regency42!

All the best :-)