I got the same error on Xcode 12.0.1 and Xcode 12.2 beta2, Application identifier of the parent app, "{team_id}." , is not a prefix of the application identifier of the app clip, "{team_id}.XXX.Clip" My project uses CocoaPods, and after adding new AppClip target, I found new XCBuildConfiguration section in Pods/Pods.xcodeproj/project.pbxproj. And I found PRODUCT_BUNDLE_IDENTIFIER was set to XXX.Clip there. I replaced the XXX.Clip string in Pods.xcodeproj/project.pbxproj with the Bundle Identifier of the AppClip project, and then error has been resolved. I hope it helps.