Forum Discussion
Calendar not available for OnPremise accounts
James1 Finally found a solution.
In order to get the calendar functionality in Teams it is needed to create a Hybrid connection between your on-premise Exchange server and Azure (note that trusted SSL is then needed).
If that still does not fix the issue, try to clear all msRTC attributes from onpremise AD accounts, then resync.
Those two actions fixed the issue for me, but note that I had onpremise Exchange2016 with latest updates and incorrectly decommissioned Skype for Business server, thats why msRTC attributes had to be cleared.
James1 Finally found a solution.
In order to get the calendar functionality in Teams it is needed to create a Hybrid connection between your on-premise Exchange server and Azure (note that trusted SSL is then needed).
If that still does not fix the issue, try to clear all msRTC attributes from onpremise AD accounts, then resync.
Those two actions fixed the issue for me, but note that I had onpremise Exchange2016 with latest updates and incorrectly decommissioned Skype for Business server, thats why msRTC attributes had to be cleared.