Calendar Problems

Fix SharePoint Cannot Find Microsoft 365 Group for Calendar Web Part

Natalie Taylor Oct 7, 2026 869 views

Question details

The user is unable to add a Group Calendar web part or Microsoft Teams to a SharePoint site because it reports the Microsoft 365 group no longer exists, despite the user being an administrator.

Fix SharePoint Cannot Find Microsoft 365 Group for Calendar Web Part

Product: Microsoft SharePoint
Device & OS: not provided
Scenario: Adding a Group Calendar web part or connecting Teams to an existing SharePoint site.
Observed behavior: SharePoint displays an error stating the Microsoft 365 group does not exist, and associated shared mailbox and calendar features become unavailable.

Before you start

Ensure you have the necessary administrator permissions for the Microsoft 365 admin center and SharePoint site before attempting to test, modify, or recreate any groups.

Solution 1Recommended

Test the Connection and Recreate the Damaged Microsoft 365 Group

Rule out browser cache issues and replace the corrupted Microsoft 365 group to restore the calendar and shared mailbox functionality.

In some cases, the backend provisioning of a Microsoft 365 group can become corrupted. This breaks the connection to the SharePoint site, rendering web parts and shared mailboxes unusable.

Test in Incognito mode

Open your web browser in an InPrivate or Incognito session, navigate to your SharePoint site, and attempt to add the Group Calendar web part again to rule out caching errors.

Create a test group

If the issue persists, log into the Microsoft 365 Admin Center, create a temporary test Microsoft 365 group, and confirm if the shared mailbox and calendar web parts function correctly for the new group.

Recreate the original group

If the test group works normally, delete the original damaged group and recreate it using the same naming conventions to restore full functionality.

Test the Connection and Recreate the Damaged Microsoft 365 Group

Data Backup Warning: Deleting a Microsoft 365 group will also delete its connected SharePoint site. Ensure any critical files or data stored in the associated document libraries are safely backed up before proceeding with the deletion.

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Frequently Asked Questions

Why does SharePoint say my Microsoft 365 group does not exist?

This error usually occurs when the backend provisioning of the Microsoft 365 group gets corrupted or falls out of sync with SharePoint, preventing features like the Group Calendar web part and shared mailboxes from functioning properly.

Can a browser cache cause the Group Calendar web part to fail?

Yes, an outdated or corrupted browser cache can sometimes display stale permissions or connectivity errors. Always test the SharePoint site in an InPrivate or Incognito window to rule out local browser cache issues.

Will deleting the damaged Microsoft 365 group delete my SharePoint site?

Yes, deleting a Microsoft 365 group will also delete its connected SharePoint team site, shared mailbox, and planner. Ensure you back up all necessary files and data before proceeding with the deletion.

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