I ended up doing something like this: extension AppDelegate: UNUserNotificationCenterDelegate { /// This is called when a notification is received while the app is in the foreground. /// There is an iOS 18 bug where it is called twice (https://forums.developer.apple.com/forums/thread/762126). /// As a workaround we are checking for duplicate ids and ignoring the second notification func userNotificationCenter( _: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void ) { let lastNotificationKey = "lastNotificationKey" var isDuplicateNotification = false if let lastNotification = UserDefaults.standard.value(forKey: lastNotificationKey) as? String { isDuplicateNotification = lastNotification == notification.request.identifier } UserDefaults.standard.set(notification.request.identifier, forKey: lastNotificationKey) // If this is not a duplicate notification, process it normally if !isDuplicateNotification { // Add code to process notification using notification.request.content.userInfo } completionHandler([]) } }