Polycom phone won't connect to Exchange Online

Having an issue with Polycom CX600 connecting to EWS.  Lync 2010 on-prem, Exchange Online.  All Lync and Exchange functions working normally (Lync 2010 client, Outlook 2010, calendar, UM) all good.  CX600 gives error "Microsoft Exchange
integration unavailable" and "Connection to Exchange is unavailable due to invalid network credentials".  I have updated to code level 4.0.7577.4450.  DNS records (autodiscover.domain.com) and SRV (_autodiscover._tcp.domain.com) point
to autodiscover.outlook.com.  Reset phone to defaults, re-provisioned using USB cable.  Credentials entered in UPN format.  Fails with both 2010 client on desktop and 2013 client.  Lync client can access history, Voice Mail, Calendar (2013)
so no problem for client.
Ideas?
RJ

Hi Russ
Ensure that the ews internal and external url are set correctly.
Also make sure that you have published reverse proxy for ews as this could be issue as well .
Also there is a similar issue with regards to the same refer below blog  which mentions the common name and the SAN entries value should be correctly set 
http://ucken.blogspot.com/2011/09/lync-deskphones-and-exchange.html
Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts on http://exchangequery.com

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