UnityWebRequest does not work on HoloLens

Hi,
I want to download a txt-file from a Server.
So here is my code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;

public class DownloaderScript : MonoBehaviour {
    

    public void GetFile()
        {
            StartCoroutine(Check());
        }

        private IEnumerator Check()
        {
            UnityWebRequest www = UnityWebRequest.Get("http://examplesite.com/example.txt");
            yield return www.SendWebRequest();
            if (www.error != null)
            {
                Debug.Log(www.error);
                
            }
            else
            {
                Debug.Log(www.downloadHandler.text);
               
            }

          

        }

    }

It works perfectly on the Unity Editor, but not on the HoloLens Emulator.
“InternetClient” is activated in the PlayerSettings and I also tried to set www.chunkedTransfer = false.
Did anyone had the same issue?

Edit: I updated Unity and it worked. So it was a Bug.