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How to Fix SharePoint Planner Tasks Disappearing or Not Synchronizing

Tauseeq Magsi Sep 28, 2026 869 views

Question details

Users need to resolve an issue where SharePoint Planner tasks and updates fail to save permanently and assignment email notifications stop sending.

How to Fix SharePoint Planner Tasks Disappearing or Not Synchronizing

Product: Microsoft Planner and SharePoint
Device & OS: not provided
Scenario: Managing tasks and team assignments within Microsoft Planner integrated with SharePoint.
Observed behavior: Tasks and updates appear to save initially but disappear after refreshing or leaving the page. Assignment email notifications have also stopped working, and the problem affects multiple users and networks.

Before you start

Verify that your internet connection is stable and try accessing SharePoint Planner from a different web browser or in incognito mode to rule out local cache issues.

Solution 1Recommended

Contact Microsoft 365 Administrator to Open a Service Request

Since this synchronization issue affects multiple users and networks, it requires a backend investigation by Microsoft support via your organization's administrator.

When Planner tasks disappear upon refreshing and notifications fail network-wide, it indicates a breakdown in communication between the user interface and Microsoft's backend servers. Because end-users cannot access server logs, administrative intervention is required.

Identify your IT administrator

Locate the IT administrator or the person responsible for managing Microsoft 365 accounts within your organization.

Report the synchronization failure

Provide your administrator with specific details: note that tasks vanish after refreshing, assignment emails are missing, and that it is affecting multiple users across different networks.

Open a service request

Ask the administrator to log into the Microsoft 365 admin center, navigate to the 'Support' section, and create a new service request so Microsoft engineers can collect diagnostic logs and investigate the Planner synchronization problem.

Check Service Health Dashboard: Administrators should first check the Microsoft Service Health Dashboard in the admin center to see if there is an active, known incident affecting SharePoint or Planner services.

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Frequently Asked Questions

Why are my Planner tasks disappearing immediately after I create them?

This happens due to a synchronization failure between the Planner web interface and Microsoft's backend servers. The application shows the task as created locally on your screen, but the server fails to save it, causing it to disappear when the page reloads.

How can I check if Microsoft Planner is experiencing an outage?

Only users with administrative privileges can view the Service Health Dashboard in the Microsoft 365 admin center. You will need to ask your IT department to check for any active advisories or outages related to Planner or SharePoint.

Are there any browser troubleshooting steps I can try before escalating to IT?

Yes, you can try clearing your browser's cache and cookies, logging completely out of your Microsoft 365 account, and logging back in. You can also test the Planner app in a private or incognito browsing window to ensure a browser extension isn't blocking the synchronization scripts.

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