I’m not be allowed to remove old payment method

I’m not being allowed to remove old card that was saved to pay for additional iCloud storage

See -> Remove a payment method from your Apple ID

Remove a payment method from your Apple ID - Apple Support

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If you can't remove a payment method

If you have subscriptions like iCloud+, have an unpaid balance, or you use purchase sharing, you must keep at least one payment method on file.

• Do you have a subscription? You can cancel iCloud+ and cancel other subscriptions from Apple. When your subscription period is over, remove your payment method.
• If you're in a Family Sharing group and you use purchase sharing, the family organizer must have a payment method on file. If you're the family organizer, turn off purchase sharing, then remove the payment method.
• If you have an unpaid balance, you might not be able to remove a payment method. Instead, change your payment method.
• 👉 If you still can't remove a payment method, contact Apple Support.

iCloud+ plans and pricing -> iCloud+ plans and pricing - Apple Support

• Accepted payment methods for iCloud+ upgrades include credit cards, debit cards, and your Apple Account balance. If you don't have enough available funds in your Apple Account balance to complete your upgrade, you'll be charged the remaining amount. Apple Store gift cards aren't accepted as payment for upgrading iCloud+.

Hello ~ Have you added a new payment method and then tried to remove the old one? If so click on below…

Change or remove the payment cards that you use with Apple Pay - Apple Support

~Katana-San~