Forum Discussion
Calendar button missing - On Prem 2016 Exchange
I had exactly the same issue as you and have solved it by following OAUTH manual setup to the letter via this doc https://docs.microsoft.com/en-us/exchange/configure-oauth-authentication-between-exchange-and-exchange-online-organizations-exchange-2013-help?redirectedfrom=MSDN
Get-IntraOrganizationConnector |fl Name,TargetAddressDomains,DiscoveryEndpoint,Enabled
brought no errors but no data. I had previously ran HCW and this completed with no errors (I assumed the hybrid process was fully complete). Exchange 2016 on premises, premium office 365 with licenses applied for exchange online plan. No mailboxes have been migrated, all are on premises. On premises existing Mail contacts and groups WERE visible in exchange online admin. AD Azure connect was already run with optional hybrid exchange enabled. Calendar button did not appear in teams. Teams worked otherwise.
So I ran the manual configuration of OAUTH from that link and calendar button started to appear after 30 mins. Again, these are ALL on premises mailboxes, we have not migrated any mailboxes yet.
One caveat, at the end of the process you need to create an AD object - this object had already been created so it looked like HCW had at least tried to make the OAUTH link but hadnt fully completed it.
David Bargna please allow me to add my 2 cents.
You don't really need Exchange full or minimal to get the calendar button in Microsoft Teams.
It is enough if you have
- Azure AD Connect, active Exchange Hybrid under sync options
- Autodiscover entry in Public DNS and Exchange Server accessible from MS Teams IP addresses
- OAUTH configured as described in the following article, steps 1-5 should be enough
- https://docs.microsoft.com/exchange/configure-oauth-authentication-between-exchange-and-exchange-online-organizations-exchange-2013-help
Please let me know if your issue is solved and mark also the reply that helped you as correct.
Thank you
Spikar
Any idea why I'm getting this error when I try to export auth cert from step 3?
You cannot call a method on a null-valued expression.
At C:\ExportAuthCert.ps1:9 char:1
+ $certBytes = $oAuthCert.Export($certType)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : InvokeMethodOnNull
Exception calling "WriteAllBytes" with "2" argument(s): "Value cannot be null.
Parameter name: bytes"
At C:\ExportAuthCert.ps1:11 char:1
+ [System.IO.File]::WriteAllBytes($CertFile, $certBytes)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : ArgumentNullException