我已经配置了我的iOS和Watch应用程序，100%遵循苹果在我提到的文档中所写的内容，并且这些应用程序没有通过CloudKit同步。
解决方案是将PersistenceController修改为：

import CoreData

struct PersistenceController {
  static let shared = PersistenceController()
  let container: NSPersistentCloudKitContainer
  
  var context: NSManagedObjectContext {
    return container.viewContext
  }
  
  init(inMemory: Bool = false) {
    container = NSPersistentCloudKitContainer(name: "MyApp")
    container.viewContext.automaticallyMergesChangesFromParent = true
    container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy

    guard let description = container.persistentStoreDescriptions.first else{
      fatalError("###\(#function): Failed to retrieve a persistent store description.")
    }
    
    description.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
    
    // Generate NOTIFICATIONS on remote changes
    description.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)
    description.cloudKitContainerOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: "iCloud.com.myCompany.MyApp")

    
    if inMemory {
      container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
    }

    container.loadPersistentStores(completionHandler: { (storeDescription, error) in
      if let error = error as NSError? {
        fatalError("Unresolved error \(error), \(error.userInfo)")
      }
    })
  }
}

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然后从iPhone和Watch中删除应用程序并再次运行。它将立即工作。