Exchange On premise Calendar integration with MS teams

GoodResource 326 Reputation points
2022-06-09T09:28:26.397+00:00

Hi We have Exchange Hybrid in place where some users on cloud some at on premise exchange. All are syncing from On premise AD via AAD COnnect. However On premise Exchange mailbox users unable to see Calendar tab in MS teams where Exchange Online users can. What the are exact steps to be followed to ensure calendar integration works for On premise exchange. I know some high level talks about publishing EWS and OAUTH but what are the exact steps to be followed if anyone can help please?

Exchange | Exchange Server | Management
Exchange | Exchange Server | Management

The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.

Exchange | Hybrid management
Exchange | Hybrid management

The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.

Microsoft Teams | Microsoft Teams for business | Other
0 comments

2 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Deleted

    This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.

    Comments have been turned off. Learn more

  2. Kai Yao 37,791 Reputation points Moderator
    2022-06-10T05:06:56.667+00:00

    Hi @GoodResource

    Have you checked this link?
    Configuring Teams calendar access for Exchange on-premises mailboxes

    Please refer to this part:

    To make calendar access work for your on-prem mailboxes, Teams needs access to your Exchange on-prem organization for both Autodiscover and EWS. There are several things to remember here.

    • Autodiscover and EWS URLs should be available from the Internet. Pre-Auth is not supported. If you use some sort of publishing system, you will need to configure pass-through. You can verify that external URLs on-prem are accessible, trying to open them from internet directly in web browser. Test with https://mail.contoso.com/EWS/Exchange.asmx and https://autodiscover.contoso.com/Autodiscover/Autodiscover.xml .You can also use http://aka.ms/exrca to test connectivity for EWS and AutoDiscover. But note, that those tests don’t use OAUTH (as of this writing). So, sometimes you might see that those tests pass successfully, but free/busy for on-prem users is not visible from your tenant (see further below for more troubleshooting tips).
    • OAUTH authentication should be configured and working between you O365 tenant and Exchange on-prem. To make this work, we highly recommended to run Hybrid Configuration Wizard (HCW) to configure full hybrid mode. For on-premises deployments (newer than Exchange 2010) HCW automatically configures OAUTH between on-premises and EXO. Please make sure to run the latest CUs on-premises as per our Hybrid requirements.

    The article also includes troubleshooting methods, which may help when it is still not working for you after the configuration.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
    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.

    Was this answer helpful?

Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.