Calendar Tab in Teams not showing, with hybrid Exchange

Question

Hello,

We're having an issue with the Calendar Tab in Teams, with hybrid Exchange 2019.

I ran the MS Remote Connectivity Analyzer for the Teams Calendar Tab. Everything is green, except "The user mailbox is marked as undiscoverable by the Teams middle-tier service."

I tried several things using various MS articles.

https://learn.microsoft.com/en-us/microsoftteams/troubleshoot/exchange-integration/teams-exchange-interaction-issue

OAutAutenetication is set to True. The Autodiscovery test passed as well and EWS seems fine too.

I would like to troubleshoot it here with an expert and share the output I get from

Get-WebServicesVirtualDirectory | FL

Get-AutodiscoverVirtualDirectory | FL

Thanks,

Edy

Answer 1

Hi @Edy Werder ,

Based on your description, the Autodiscover V2 of the Teams Calendar Tab test passed?

Please run the following test:
From your on-prem Exchange management shell:
Test-OAuthConnectivity -Service EWS -TargetUri https://outlook.office365.com/ews/exchange.asmx -Mailbox <On-Premises Mailbox> -Verbose | Format-List
Connect to the Exchange online powershell:
Test-OAuthConnectivity -Service EWS -TargetUri <external hostname authority of your Exchange On-Premises deployment>/metadata/json/1 -Mailbox <Exchange Online Mailbox> -Verbose | Format-List
Also try replacing <Exchange Online Mailbox> with a synced user mailbox.

And see if you could enter the redirect page:

https://outlook.office365.com/autodiscover/autodiscover.json?Email=**admin[@](/users/na/?userId=a28c79c1-c609-48db-b55f-1783d1187afb).com**&Protocol=EWS&RedirectCount=5
Replace the admin@Company portal .com with your on-prem admin account.

This document may help:https://techcommunity.microsoft.com/t5/exchange-team-blog/configuring-teams-calendar-access-for-exchange-on-premises/ba-p/1484009
And https://learn.microsoft.com/en-us/answers/questions/609428/exchange-hybrid-teams-calendar-missing.html

Best regards,
Lou

---

If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 2

Hi,

Thanks for your response. I appreciate it. We only have an on-prem Exchange Server 2019 and not Exchange Online. We synchronized our users with Azure Connect and would like to use Teams with the Calendar tab.

I ran the on-premise Test OAuth. The output has some errors

Could you please help how to fix it?

Thank you!
Edy

Answer 3

Thanks Lou,

It is working now. Thank you very much!

I re-ran the HCW with a full hybrid. The TestOauthConnectivity passed then.

After that, I followed this oauth-with-online-and-on-premises

articles.

After that the Teams Calendar Tab Analyzer test passed too and more important the Calendar tab appeared in Teams.

Cheers,
Edy