Hello, I refer to this documentation: https://developer.apple.com/documentation/coredata/mirroring_a_core_data_store_with_cloudkit/setting_up_core_data_with_cloudkit This worked for me, the data syncs between CoreData and iCloud. Now the app in the xcode-simulator should be informed when on another device the data changed und synced to iCloud. Like this documentation: https://developer.apple.com/documentation/usernotifications/setting_up_a_remote_notification_server/pushing_background_updates_to_your_app I implemented the function :didReceiceRemoteNotification in the AppDelegate. But the function never gets called in the simulator. can the simulator receive Background Notifications? is really nothing more neccessary than implementing the function didReceiveRemoteNotification? how can I call a method in the present viewcontroller from the AppDelegate? Thanks for hints Klaus