Thank you for your response. I would like to clarify that all previously suggested steps have been completed: StoreKit Testing Disabled StoreKit configuration in Xcode is not used. The app connects directly to Apple’s sandbox environment for testing. Successful Sandbox Testing The In-App Purchase product (remove_ads, Non-Consumable) has been thoroughly tested in the sandbox environment. The StoreKit purchase sheet appears correctly, and the transaction completes successfully. A screen recording is available to demonstrate this behavior. Product Properly Submitted The In-App Purchase product is fully configured in App Store Connect and has been submitted for review together with the app version. Both the app binary and the IAP product are included in the same submission. Despite this, the app continues to be rejected again under Guideline 2.1(b) stating that "Premium feature was still implemented without triggering any purchase flow."