I am unable to open the calendar in Teams

Question

I am unable to open the calendar in Teams for [Moderator note: personal info removed]@allenovery.com account

Answer 1

Dear Mehta, Forum: IT (LN),

Thank you for posting your question on the Microsoft Q&A forum.

I understand how frustrating it can be when you’re unable to open the Calendar in Microsoft Teams. To better assist you, could you please clarify the exact behavior? 

• Is the Calendar tab missing, or do you see an error message when trying to access it?
• Does the issue occur in Teams Classic, New Teams, or the web version?

In the meantime, please review the checks below:

1/ Confirm license and related configuration

The Teams Calendar requires an active Exchange Online mailbox.

Please verify:

• Does the account have a valid Exchange Online license assigned?
• Can you access Outlook (web or desktop) with the same account?

If Outlook does not work or shows that no mailbox is provisioned, the Calendar in Teams will not open.

You may ask your IT admin to confirm this by checking in the Microsoft 365 Admin Center:

• Go to Users > Active Users
• Select the affected user
• Click Licenses and Apps. 
• Ensure the following are enabled:
  • Microsoft Teams
  • Exchange Online

2/ Check on different Team versions

Calendar issues sometimes occur in the New Teams client so you can check by 

• Switch between New Teams and Classic Teams
• Sign out completely > Close Teams > Reopen > Sign in again
• Open the Calendar in the Teams web version (https://teams.microsoft.com) to see if it works there

3/ Clear the Teams cache

If the issue occurs only in the desktop app, clearing the Teams cache may help. Please follow the official Microsoft guidance below: https://learn.microsoft.com/en-us/troubleshoot/microsoftteams/teams-administration/clear-teams-cache

4/ Check if the Calendar App is disabled

In Teams, click Apps, search for Calendar to ensure it is not blocked

You can ask admins to verify this in:

Teams Admin Center > Teams apps > Manage apps > Review the "available to" and "app status"

I hope this information helps. If you have any additional details or questions, please feel free to share them.

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Answer 2

For a work account such as *@allenovery.com, the Teams calendar depends on both Teams policies and Exchange integration. Use these checks in order:

1. Verify the correct account and app
   • Sign out of any personal/Free Teams accounts and sign back in with the *@allenovery.com work account.
   • Make sure the work version of Microsoft Teams is being used, not Microsoft Teams (free). If signed in with a personal account, the full Calendar app may be missing.
2. Confirm the Calendar app is enabled for the user An IT admin needs to check this in the Teams admin center:
   1. Go to Users > Manage users, open the affected user, then View policies.
   2. Under App setup policy, open the policy assigned to the user.
   3. In the list of pinned apps, confirm the Calendar app (ID ef56c0de-36fc-4ef8-b417-3d82ba9d073c) is present.
   4. If the Calendar app is missing, add/restore it in the policy and save. This will surface the Calendar icon in Teams for that user.
3. Check Teams coexistence mode Still in the Teams admin center for that user:
   1. Under Account, check Coexistence mode.
   2. Ensure it is not set to Skype for Business only or Skype for Business with Teams collaboration.
   3. If it is set to Use Org-wide settings, then under Org-wide settings > Teams upgrade, ensure the tenant default coexistence mode is also not one of those two Skype-only modes.
   4. Set a mode that allows Teams meetings (for example, a mode where Teams is the primary meetings app), then save.
4. If the Calendar icon appears but the calendar itself will not open
   • This typically indicates an interaction issue between Teams and Exchange. After confirming steps 2 and 3, allow some time for policy changes to propagate, then sign out of Teams and sign back in.
   • If the issue persists, the tenant admin should continue with the remaining Exchange/Teams interaction checks in the same guidance used above for the Calendar app issue.

If none of the above resolves the problem, the organization’s IT admin should open a support ticket with Microsoft so backend logs for the account and tenant can be reviewed.

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References:

• Resolve interaction issues between Teams and Exchange Server
• See all your meetings in Microsoft Teams
• Signed in to the wrong account in Microsoft Teams Free