Your purchase could not be completed
Why is it writing this...
iPhone XR, iOS 14
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You may see various forms of a "Your purchase could not be completed" message. Some may show old URLs which will redirect to the current one which leads you to a page to select your country. Since it says to contact iTunes Support, try this:
1. Click on this link --> https://support.apple.com/choose-country-region/media-services
2. Select your country
3. Select: Billing & Subscriptions
4. Select: Subscriptions & Purchases
5. Select: Update payment method
6. Select a chat session or a phone call.