Exchange EWS hybrid Office 365

Hi Experts!

Office 365 try connecting my exchange2010 ews service. i have deployed bigip ver 12 hf2 with iapp 1.6 for exchange. when i try to surf into https://myexchange.com/EWS/mrsproxy.svc i get: HTTP/1.1 401 Unauthorized WWW-Authenticate: Basic realm="myexchange.com" Set-Cookie: MRHSession=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; path=/ Connection: close Content-Length: 0

but i need it to give this output:

HTTP/1.1 401 Unauthorized Server: Microsoft-IIS/7.5 WWW-Authenticate: Negotiate WWW-Authenticate: NTLM X-Powered-By: ASP.NET Date: Sun, 18 Sep 2016 21:11:48 GMT Content-Length: 0 Proxy-Support: Session-Based-Authentication

i tried to add stream profile and this irule but is not working

when HTTP_REQUEST {

STREAM::disable

}

when HTTP_RESPONSE {

  STREAM::expression {@Ntlm@Basic@ @Negotiate@Basic@}
  log local0. " stream worked"

  STREAM::enable

}

How can i replace WWW-Authenticate: Basic realm="myexchange.com" with WWW-Authenticate: Negotiate ,or what i have to do that ews will work with negotiate auth?

Thanks,

Aviv Hassidim