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As Swift give as async await functions, I tried to use them for push notifications. In my case if I use extension TMNotificationCenter: UNUserNotificationCenterDelegate { func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) { completionHandler([.sound, .banner, .list, .badge]) } func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) { completionHandler() } } There are no error, erevything works fine, but when I change to this: extension TMNotificationCenter: UNUserNotificationCenterDelegate { func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification) async -> UNNotificationPresentationOptions { print(#function) return [.sound, .banner, .list, .badge] } func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse) async { print(#function) } } I got crash: What I am doing wrong?