MTR Event 2001 with Poly G85-T

Hi, 

We are trying to set up Poly MTR G85-T and it is not coming up properly. Event viewer is throwing up  error 2001 ("We can't sign you in because the server couldn't be reached or the server version is incompatible with the device").

However signing into Admin account makes every thing works fine. Calling, Audio and Video are working once manually signed into the "Admin" account. But it throws up error 2001 when restart and the system autoamtically sign into the "skype" acccount. All siganling traffic is going through proxy and all required URL are white listed in proxy. MTR Room Account is setup as per Microsoft recommendation and License is also assigned correctly.

Any help would be much appreciated.