Payment method

Look up the country to which your ID is set in:

Payment methods that you can use with your Apple ID - Apple Support

Have you changed countries recently? It maybe you are using a payment method from a previous country and need to use one from your current country.

I'm still not clear if you changed countries. A "storefront" issue usually refers to trying to use a payment method from another country which isn't valid in your country. Make sure this is one of the 'Payment methods that you can use with your Apple ID'; click here --> Payment methods that you can use with your Apple ID - Apple Support A solution may be to use a method from the same country as the store you are using, but Apple no longer states either way if this is a requirement (it used to say, "Make sure that the billing address for your payment method matches the billing address for your Apple ID" which was more helpful than saying nothing the way it currently does). Also read any footnotes in the document for a payment method. Unfortunately the list is somewhat general and does not list individual brands of cards (I guess there are too many and are constantly changing).