Forum Discussion
Calender in Teams not working with Onprem Mailboxes / Hybrid with Exchange 2016
Microsoftfranz_muc Please double check Step 1 & step 5 from this article. Ensure EvoSts auth server is created and all EWS urls are added as SPNs
https://docs.microsoft.com/en-us/exchange/configure-oauth-authentication-between-exchange-and-exchange-online-organizations-exchange-2013-help
Evosts wird erstellt:
[PS] C:\Windows\system32>Get-AuthServer
Name IssuerIdentifier Realm TokenIssuingE
ndpoint
---- ---------------- ----- -------------
ACS 00000001-0000-0000-c000-000000000000 fa6091e2-d174-42cc-bb94-892e54872398 https://ac...
EvoSts https://sts.windows.net/fa6091e2-d174-42cc-bb94-892e54872398/ fa6091e2-d174-42cc-bb94-892e54872398 https://lo...und die richtigen Directories gibt es auch, sie zeigen auf die richtigen internen und externen adressen:
[PS] C:\Windows\system32>Get-MapiVirtualDirectory | FL server,*url*Server : XXXXX
InternalUrl : https://XXX.YYY.local/mapi
ExternalUrl : https://XXX.YYY.de/mapi[PS] C:\Windows\system32>Get-WebServicesVirtualDirectory | FL server,*url*
Server : XXX
InternalNLBBypassUrl :
InternalUrl : https://XXX.YYY.local/EWS/Exchange.asmx
ExternalUrl : https://XXX.YYY.de/ews/exchange.asmx[PS] C:\Windows\system32>Get-OABVirtualDirectory | FL server,*url*
Server : XXX
InternalUrl : https://XXX.YYY.local/OAB
ExternalUrl : https://XXX.YYY.de/OAB- Tushar Pathak
franz_muc Thanks! It could well be a connectivity issue. Please run Exchange RCA to check if you successfully connects to EWS externally (run the test from external machine).
https://testconnectivity.microsoft.com/Default.aspx?testId=ewsTask
Also ensure teams Ip address mentioned in below doc are whitelisted on firewall.
https://docs.microsoft.com/en-us/office365/enterprise/urls-and-ip-address-ranges#skype-for-business-online-and-microsoft-teams
