How do I resolve an active subscription linked to Apple Account preventing app downloads on iPhone?

If any of the six options listed below is true, selecting "None" as a payment method won't appear, and you cannot remove an expired or lost card. In such cases, providing billing information is mandatory.

The "None" option will not appear...

1. If you have an unpaid balance or payment due
2. If you have a subscription that automatically renews
3. If you're using the iTunes Store or App Store for the first time
4. If you are not in the country or region you’re creating an Apple ID for
5. If you changed your country or region
6. If you're a part of Family Sharing

Based on your country of residence and country you have selected under your Apple ID --> Payment methods that you can use with your Apple ID - Apple ...

Have you a Debit/Credit card issued to you that is valid internationally and from the same Country / Region as your Apple ID?

How to see what you've been charged for

• To see your purchase history, go to reportaproblem.apple.com.
• Sign in with your Apple ID.
• A list of purchases will appear. To see family members' purchases, select the Apple ID button and choose a family member.
• To see the full receipt, including tax, tap or click the date.

If you don't recognise a charge - Apple Support (IN)

You may view a subscription to an app --> See or cancel your subscriptions - Apple Support