@DTS Engineer hello, I have same issue, below are details as you requested: Without NSExtensionPrincipalClass in Info.plist -> App Store Connect rejects upload with: "Missing Info.plist values. No values for NSExtensionMainStoryboard or NSExtensionPrincipalClass found in extension Info.plist" Screenshot of the extension's Info.plist Screenshot of the extension's Info.plist Screenshot of the main app's Info.plist With NSExtensionPrincipalClass -> Local install fails with: "defines either an NSExtensionMainStoryboard or NSExtensionPrincipalClass key, which is not allowed for the extension point com.apple.deviceactivityui.report-extension" Screenshot of the error encountered Screenshot of the extension's Info.plist Screenshot of the main app's Info.plist Environment: macOS Version 15.7.3 (Build 24G419) Xcode 26.0.1 (24229) (Build 17A400) iOS 26.2 Thanks you!

@DTS Engineer please help check my comment above (https://developer.apple.com/forums/thread/812380?answerId=874754022#874754022). I've provided all information you need. Currently unable to release new app. Please help, thanks!