Can’t remove my payment method

As the message says, first you’ll need to end your active subscription via settings>your name>subscriptions before you can remove the payment method

Its weird that you cannot remove it due to active subscriptions as there aren’t any, but I see 2 other options why you cannot remove the card:

1: the card is declined, before you remove it you must update your payment meth

2: You cannot remove your only payment method, you’ll need to have at least one payment method on file.

I hope this shines some light on the situation for you!

Sometimes, you cannot have only your Apple ID account balance and needs to have a different payment method on file

But you can try to rearrange your payment methods:

1. On the Payment & Shipping screen, tap Edit.
2. Touch and hold a payment method to drag it further up or down your list of payment methods. Apple will attempt to charge your payment methods in the order that they appear.
3. Tap Done.

If you already have a payment method on file, learn how to change or update your payment method.

This payment method has been declined so to see.

See this instructions to see if you can solve that

If you still can't make a purchase

• You might have an unpaid order. Learn how to pay an unpaid order.
• Contact your financial institution. 
  • You might need to ask your financial institution to allow international purchases on your debit or credit card.
  • If you want to know why a debit card, credit card, or other payment method was declined, speak with your financial institution. Apple doesn't have information about why the payment method was declined.
• In some countries and regions, your payment method might be declined because of changes to local law. Learn about billing and purchases in Europe or what to do if your card is declined in India.
• Still need help? Contact Apple Support.

See this link for further reference

If your payment method is declined in the App Store or iTunes Store - Apple Support

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