It tells me to add card details and when I do it says they already exist, so when I go to remove them, it doesn't allow me as it says there is an active subscription.
[Re-Titled by Moderator]
iPhone 12, iOS 18
If your payment method has an issue and cannot be charged, you will need to either re-verify it, or add a new one that can be charged.
You won't be allowed to remove your only payment method if there's a subscription active, so you need to either add another payment method first, or verify the one that is there already.
click here ➜ If you need to change or update your Apple Account payment method - Apple Support
Unable to download apps or edit payment method
