CloudKit通知不会到达生产环境（AppStore、TestFlight），但可以在开发模式下工作（从Xcode安装）。
为什么？
以下是我注册远程通知的方式：

let center = UNUserNotificationCenter.current()
    
    center.delegate = self
    center.requestAuthorization(options: [.alert, .badge, .sound]) { authorised, error in
        
        DispatchQueue.main.sync {
            application.registerForRemoteNotifications()
        }
    }

这是我保存订阅的方式：

func subscribeForChanges() {
    
    let options: CKQuerySubscriptionOptions = [.firesOnRecordCreation, .firesOnRecordUpdate, .firesOnRecordDeletion]
    
    let serviceSubscription = CKQuerySubscription(recordType: "Service", predicate: NSPredicate(value: true), options: options)
    let goalSubscription = CKQuerySubscription(recordType: "Goal", predicate: NSPredicate(value: true), options: options)
    let territorySubscription = CKQuerySubscription(recordType: "Territory", predicate: NSPredicate(value: true), options: options)
    let addressSubscription = CKQuerySubscription(recordType: "Address", predicate: NSPredicate(value: true), options: options)
    let noteSubscription = CKQuerySubscription(recordType: "Note", predicate: NSPredicate(value: true), options: options)
    let daySubscription = CKQuerySubscription(recordType: "Day", predicate: NSPredicate(value: true), options: options)
    let shareSubscription = CKQuerySubscription(recordType: "cloudkit.share", predicate: NSPredicate(value: true), options: options)
    
    let notificationInfo = CKNotificationInfo()
    notificationInfo.shouldBadge = false
    notificationInfo.shouldSendContentAvailable = true
    
    serviceSubscription.notificationInfo = notificationInfo
    goalSubscription.notificationInfo = notificationInfo
    territorySubscription.notificationInfo = notificationInfo
    addressSubscription.notificationInfo = notificationInfo
    noteSubscription.notificationInfo = notificationInfo
    daySubscription.notificationInfo = notificationInfo
    shareSubscription.notificationInfo = notificationInfo
    
    let privateSubscriptionsOperation = CKModifySubscriptionsOperation(subscriptionsToSave: [serviceSubscription, goalSubscription, territorySubscription, addressSubscription, noteSubscription, daySubscription, shareSubscription], subscriptionIDsToDelete: nil)
    privateSubscriptionsOperation.database = CloudAssistant.shared.privateDatabase
    
    let notificationInfoDatabaseSubscription = CKNotificationInfo()
    notificationInfoDatabaseSubscription.shouldSendContentAvailable = true
    
    let subscription = CKDatabaseSubscription(subscriptionID: "pl.blue-world.fieldservice.sharedDatabase")
    subscription.notificationInfo = notificationInfoDatabaseSubscription
    let sharedSubscriptionsOperation = CKModifySubscriptionsOperation(subscriptionsToSave: [subscription], subscriptionIDsToDelete: nil)
    sharedSubscriptionsOperation.database = CloudAssistant.shared.sharedDatabase

    let queue = OperationQueue()
    queue.maxConcurrentOperationCount = 1
    queue.addOperation(privateSubscriptionsOperation)
    queue.addOperation(sharedSubscriptionsOperation)
    privateDatabase.save(CKRecordZone(zoneName: "fieldservice")) { _, _ in }
}