I'm having this issue as well and not sure how to move forward. The app works on macOS 14 fine, on macOS 15 my testers are getting: This is a multi-platform SwiftUI based app that I plan on supporting iOS 17/18 and macOS 14/15. They both need shared app group containers to function. How do I configure this correctly in Xcode? Thanks! – Zach

This app is currently in beta through TestFlight, but will be distributed through the App Store on both platforms.