I’m experiencing a similar issue on macOS 26.3 (25D125). My app, FontView 1.0 (6), is approved for external TestFlight testing. In the TestFlight build: Storefront.current returns USA/143441. The subscription price displays $0.99 USD. My purchase Apple Account is registered in Japan. Purchasing shows “Account Not In This Store”. Selecting “Change Store” opens the Japanese App Store, followed by “Cannot connect to the App Store”. On the same Mac, a local development build with StoreKit Configuration set to None and a Japanese Sandbox tester returns JPN/143462 and ¥120 JPY. Purchase and restoration succeed. Feedback Assistant report: FB25375721 I have added the external TestFlight invitation URL to that report. Could Apple investigate whether this is related to the previously reported macOS TestFlight storefront issue?