Bug Unity relay failed to join relay 404 error

This is my creating relay code. But sometimes client isn't unable to join. Its gives relay code doesn't exists 404 error
//Only called when Starting as host
private async void AllocateRelay()
{
try
{
Allocation joinAllocation = await RelayService.Instance.CreateAllocationAsync(4);
m_RealyCode = await RelayService.Instance.GetJoinCodeAsync(joinAllocation.AllocationId);

NetworkManager.Singleton.GetComponent<UnityTransport>().SetRelayServerData(new RelayServerData(joinAllocation, "dtls"));
NetworkManager.Singleton.StartHost();
Debug.Log("Create relay " + m_RealyCode);
}
catch (Exception e)
{
Debug.Log(e);
OnAllocateRelayFailed?.Invoke();
LoadingUI.Instance.Show($"Failed to create game. Try again", 2f);
CustomSceneManager.Instance.LoadScene(SceneInfo.Startup);
}
}

 

I'm experiencing the same error with Version 1.1.0-pre.5.

 

Not sure if it's deprecated, but this works consistently for me:

Code (CSharp):

1.             NetworkManager.Singleton.GetComponent<UnityTransport>().SetHostRelayData(
2.                 createAllocation.RelayServer.IpV4,
3.                 (ushort)createAllocation.RelayServer.Port,
4.                 createAllocation.AllocationIdBytes,
5.                 createAllocation.Key,
6.                 createAllocation.ConnectionData
7.                 );