Test-CsMCXP2PIM bug - UPN credentials must be provided

You can get an error when doing Test-CsMCXP2PIM
Error Message : No response received for Web-Ticket service.
                Inner Exception:The HTTP request is unauthorized with client au
                thentication scheme 'Ntlm'. The authentication header received
                from the server was 'Negotiate,NTLM'.
                Inner Exception:The remote server returned an error: (401) Unau
                thorized.

when using user credentials in format domain\username. Try to use UPN credentials then user@domain.com