How can I enable my Media & Purchases account in the App Store?

If you are unable to continue with the prompt, you can try reactivating your account using the information provided from this support article:

If a message says 'Your Media & Purchases account has been disabled' - Apple Support

Another way to contact Apple Support directly:

Contact Apple Support - Apple Support

You will need to contact iTunes Support for help. You probably could have tapped Continue (as instructed) for help. Or follow the steps below to get help.

To contact iTunes Support, do this: 

1. Click on this link --> Choose your country or region - Official Apple Support  

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.

Copied from iTunes support - Apple Community

When I click that link, I don't see an option to choose my country.

M1 Mac mini, macOS 15.5;  Watch, series 10 GPS-only, watchOS 11.5; iPhone 16, iOS 18.5; TV 4th Gen, tvOS 18.5 HomePods, audioOS 18.5