How to Fix Calendar Missing in Microsoft Teams

If the Calendar option in Microsoft Teams disappears unexpectedly, you may not be able to schedule or view meetings. In most cases, this is due to a problem with your Office 365 subscription, more specifically with Exchange Online, where the service that synchronizes your Outlook and Teams calendars resides. The most prevalent cause is an inappropriate or missing Exchange Online license.

Microsoft Teams Calendar Issue

This might also be the case when your calendar application is not in the corporate app policy or you do not add it in Teams Admin settings.

Now, as you seem to have a fair understanding of the causes that may have triggered this issue, proceed ahead to the solutions given below.

1. Settle the Policy towards Setting Up an Application for MS Teams

To make the Calendar appear to everyone in the organization, you would restore it, and then specify this in the app setup policies within Teams.

Your Office 365 administrator credentials will grant access to the Microsoft Teams Admin Center. Permission Access to Users

Under Users on the left-hand side menu, click on your account for access into your account settings (General, Policy, etc.).

Under the App setup policy area of the Policies tab, click Global (Org-wide default) to enter the MS Teams policy settings.Selecting an App's Policy for Setup

For the calendar select the "Pinned apps" section. If it's not there, within the MS Teams menu, click Add apps, then select Calendar.Calendar Integration with Microsoft Teams

This should show the calendar option in the default menu once you open Microsoft Teams and should resolve your issue.

2. Make sure the Exchange Web Services Protocol is tested

If your Teams calendar is not appearing, you should check the EWS Protocol. Until you turn this protocol on, Teams can't view your outlook calendar. If EWS is turned off, Teams cannot retrieve any calendar information. Once this protocol is turned on, the calendar functionality works again.

Preconditions:

Launch Windows PowerShell as an Administrator: Locate Windows PowerShell in your Start menu, right-click on to select Run as Administrator.

Run Windows PowerShell as an Administrator

Running Windows PowerShell as an Admin

Check the status of EWS: Launch PowerShell and execute the following command. Only continue to Step 3 if "EwsEnabled" is not set to false; otherwise move to the next solution.

Execute Command in Windows PowerShell: Get-CASMailbox "Identity Name"

Enable the Web services for Exchange: This will activate the calendar within MS Teams, and this is performed by running this next PowerShell command: EwsEnabled Set-CASMailbox "Identity Name" ENABLE EXCHANGE ONLINE SERVICES

Following the opening of Microsoft Teams, this will appear on the main menu.

3. Permit Cloud Users to Use Exchange On-Premises Mailboxes

It's worth noting that hybrid capabilities should be enabled if your company uses both on-premises Exchange mailboxes and Microsoft Teams in the cloud. Enabling this setting allows synchronization of the mailboxes with Microsoft 365, so Teams can show calendar data from on-premise servers; otherwise, issues of missing calendars and data from on-premises mailboxes can't be fixed.

This solution can only be executed upon the satisfaction of certain requirements that are to be met before going into its steps of execution.

Organizational Azure Active Directory synchronization should exist.

The users must be assigned a valid Exchange mailbox on an on-premises server.

Exchange Server must have hybrid connection in place.

Exchange 2016 or later has to be installed and running on the server.

You must configure OAuth authentication.

With EXO calendars, Microsoft Teams users are allowed to share their calendars. A meeting that you have scheduled in Outlook will also show up in Microsoft Teams and vice versa. Once you have completed the steps on your end, you should allow MS Teams permission to access your on-premises Exchange organization in using Autodiscover and EWS. Following are some details that will be helpful to your organization:

In this case, it would directly access the Autodiscover and EWS URLs on the internet by your web browser. If you are using some publishing system, it needs to be configured for pass-through in case it does not support pre-authentication.

Your on-premises Exchange and Office 365 tenant should be set up and ready to go using OAuth authentication. We highly recommend creating full hybrid environment by running the Hybrid Configuration Wizard (HCW) to make this a reality. Our Hybrid requirements give you an requirement to have the latest CUs on-premises.

We want this to be one of the very easy ways through which you will get to solve the problem of not having a calendar in Microsoft Teams. Without further ado, good luck.