Teams Meeting Room - Cannot fetch calendar but DNS CNAME & Authentication Policy Correct

[dbaddorf]

Hello!  I have a customer using HP's Team Rooms hardware for O365 Teams Meeting Rooms.  These devices have the O365 Meeting Room licenses.  They connect to O365 and allow meetings between rooms (and between PC's running Teams), but I get a message "Cannot fetch calendar" at the top of the screen.

I've checked other posts, and this error seems to often be because Basic Authentication isn't enabled or because the autodiscover CNAME isn't correct.  

However, I believe that both of these issues aren't the case here.  The autodiscover CNAME shows up as correct in the O365 Admin panel (autodiscover is a CNAME for autodiscover.outlook.com).  And the 'get-user -identity "Conference Room" | fl *' shows a blank AuthenticationPolicy so I don't believe that Basic Authentication is disabled.

Can anyone point me in the correct direction?  Any help would be greatly appreciated!

Any 

[#2 · Accepted solution]

I believe that the problem was the Teams resource wasn't created correctly.  When I deleted the Teams Room and recreated it following the steps in https://docs.microsoft.com/en-us/microsoftteams/rooms/with-office-365 then I don't see the message about not being able to fetch the calendar.