Teams Room "Cannot Fetch Calendar"

Confirming we also had the same issue with one of our Crestron Teams Room device, and changing the DNS to public fixed it. Not too sure why.

bjones96  i did the same but is not working....

The account was created using the microsoft guide SRS , using this  2 commands 
New-Mailbox -Name "Project-Rigel-01" -Alias ProjectRigel01 -Room -EnableRoomMailboxAccount $true
-MicrosoftOnlineServicesID ProjectRigel01@contoso.onmicrosoft.com -RoomMailboxPassword
(ConvertTo-SecureString -String 'P@$$W0rd5959' -AsPlainText -Force)

Set-CalendarProcessing -Identity "Project-Rigel-01" -AutomateProcessing AutoAccept -
AddOrganizerToSubject $false -DeleteComments $false -DeleteSubject $false -RemovePrivateProperty $false
-AddAdditionalResponse $true -AdditionalResponse "This is a Skype Meeting room!"


and then assigning the license

Erick570 

i went in to the admin side on the MTR and changed the network adapters dns to 8.8.8.8 to get aorund our company dns 

bjones96 Hello, how did you solve this, did you make changes to the MTR, changing the internal DNS of the company or did you change the DNS to 8.8.8.8, you can finally explain how you solved it

bjones96 Great. If you changed the DNS settings locally on the MTR it is probably better that you get the DNS server updated with the correct names so that you can continue using DHCP and so that you don't get this much problems with the next devices.