Hi All, I'm developing a security application that uses an endpoint security extension. The application has two parts main and extension. I have an entitlements for Security Extension Client from Apple. I'd like to distribute apps through the Apple Store. Locally the app runs without problems on enabled machines, but when I try to get it through Testfligt to the appstore I get two errors: ITMS-90285 - Invalid Code Signing Etitlements. Your application bundle’s signature contains code signing etitlements that are not supported on MacOs. Specifically, key ‚com.apple.developer.endpoint-security.client‘ ITMS-90296 - App sandbox not enabled on extension When I turn on sandbox for extension, the extension fails to register endpoint security client let res = es_new_client(&client) { _, event in self.eventDispatcher(msg: event) Without sandbox it runs without any problem. Thank you very much for your help I don't know how to proceed. Martin