iOS15 B4 NSPersistentCloudKitContainer“帐户暂时不可用”错误

我在 iOS15 beta 4 上使用 NSPersistentCloudKitContainer 来跨设备同步核心数据。在设备上启动并登录 iCloud 时，我在日志中收到以下错误：

成功：0 madeChanges：0错误：

我有以下代码：

init(inMemory: Bool = false) {
        container = NSPersistentCloudKitContainer(name: "AppName")
        if inMemory {
            let storeDescription = NSPersistentStoreDescription(url: URL(fileURLWithPath: "/dev/null"))
            container.persistentStoreDescriptions = [storeDescription]
        } else {
            let storeURL = URL.storeURL(for: "my.app.group", databaseName: "AppName")
            let storeDescription = NSPersistentStoreDescription(url: storeURL)
            storeDescription.cloudKitContainerOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: "iCloud.my.app")
            container.persistentStoreDescriptions = [storeDescription]
        }
        
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
    }

这似乎是 beta 4 中引入的错误 -https://developer.apple.com/forums/thread/685857 https://developer.apple.com/forums/thread/685857