OneDrive File Issues

Fix Null Folder When Accessing OneDrive in Outlook on the Web

Natalie Taylor Oct 7, 2026 868 views

Question details

The user encounters a 'null' folder and a ClientServiceException when trying to access OneDrive files directly through the Outlook web application.

How to Fix a Null Folder When Accessing OneDrive in Outlook on the Web

Product: Outlook on the Web / OneDrive
Device & OS: not provided
Scenario: Attempting to access or attach OneDrive files while using Outlook on the web.
Observed behavior: Selecting OneDrive in Outlook on the web displays only a folder named 'null' and triggers a Microsoft.SharePoint.Client.ClientServiceException, even though the standalone OneDrive web app works perfectly.

Before you start

Verify that you have Microsoft 365 Administrator privileges, or identify who handles IT administration for your organization, as this backend issue requires a formal support ticket.

Solution 1Recommended

Open a Support Request via the Microsoft 365 Admin Center

Since this error occurs across multiple browsers and computers, it indicates a backend tenant configuration or service integration failure that only Microsoft Support can resolve.

The Microsoft.SharePoint.Client.ClientServiceException in Outlook on the web means the integration between your Exchange online environment and SharePoint/OneDrive services is failing. Because this cannot be fixed by clearing browser cache or changing local settings, an escalation to backend support is necessary.

Log in to the Admin Center

Navigate to the Microsoft 365 admin center at admin.microsoft.com and sign in using an account with administrator privileges.

Navigate to Support

On the left-hand navigation menu, click on 'Show all' if necessary, then select 'Support' and choose 'Help & support'.

Create a New Service Request

Type a brief description of the 'null folder and ClientServiceException in Outlook web' issue into the search bar, press Enter, and then select the option to contact support.

Provide Diagnostic Details

Fill out the support ticket form detailing that the issue affects multiple users/browsers, mention the specific exception code, and submit the request so Microsoft can investigate the tenant logs.

Open a Support Request via the Microsoft 365 Admin Center

Administrator Privileges Required: If you are an end-user, you will not have access to the Microsoft 365 admin center. Please share this troubleshooting step with your company's IT helpdesk or system administrator.

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Frequently Asked Questions

Why do I see a 'null' folder when accessing OneDrive in Outlook web?

This usually indicates a backend communication error or a syncing failure between SharePoint/OneDrive services and the Outlook web application within your Microsoft 365 tenant.

Can I fix the ClientServiceException myself by clearing my browser cache?

No. Because the issue persists across multiple browsers and computers, it is a server-side problem that requires a Microsoft 365 Administrator to escalate to Microsoft Support.

Does this null folder error affect the desktop version of Outlook?

Typically, this specific integration error is isolated to Outlook on the web. Desktop versions of Outlook that use local OneDrive file syncing usually bypass this web client exception.

Document & File Issues