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
