I am trying to get the url of my ID, but the method keeps returning nil

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I did the following:

• Enabled storage of iCloud key values ​​in Xcode capabilities.
• testing on a physical device.
• iCloud and iCloud Drive are enabled on the physical device.
• Make sure to iCloud Key-Value Store
  
  add permissions to the file.

My code:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    //Override point for customization after application launch.

    let cloudURL = FileManager.default.url(forUbiquityContainerIdentifier: nil)
    print(cloudURL as Any)

    return false
}

      

        
        
        
      

    

I have searched for almost all questions related to this problem and tried to answer, but it doesn't work.