We use Polycom CX600 phones dedicated for our on-prem Lync 2013, and I’m trying to get my CX600 to integrate with my Exchange Online but it doesn’t seem to be working. I can make/receive calls and check voicemail just fine but I'm getting the dreaded "Microsoft Exchange integration unavailable" exclamation which expands to "Connection to Exchange is unavailable due to invalid network credentials". I try to sign in with the USB-tether but it doesn't change anything. We are running Exchange 2013 on-prem and Exchange Online via 365 E4. Exchange 2013 on-prem for all my users and the CX600s are fully functional (I can see calendar, contacts, call logs.). For my Exchange Online, I’ve moved only my account and I am no longer able to see my calendar, contact and call logs on the CX600. Everything works fine with the Lync 2013 client. I think this has something to do with it only have a single authentication mechanism on the CX600. Is there any known workaround to getting EO to work with CX600 phones while having it also continue working for Exchange on-premises? We are hoping to have a gradual migration to EO where only 50% of our users are moved now and 50% moved much later. Thank you.
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