Bug UDP sandbox login window not showing

Please help!!!

UDP sandbox login window not showing on simulator or android devices. I tried several devices.

/////////////////////////////////////////////////////////////

using UnityEngine;
using UnityEngine.UDP;
public class udp : MonoBehaviour
{
IInitListener listener = new InitListener();
public void Start()
{
StoreService.Initialize(listener);
}
}
////////////////////////////////////////////////////////////////

using UnityEngine;
using UnityEngine.UDP;
public class InitListener : IInitListener
{
public void OnInitialized(UserInfo userInfo)
{
Debug.Log("Initialization succeeded");
}
public void OnInitializeFailed(string message)
{
Debug.Log("Initialization failed: " + message);
}
}
////////////////////////////////////////////////////////////////////////////


Please help me to solve this problem.

Thank you.

 

I found the solution. Just select " window > unity IAP > switch store > unity distribution portal "