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How to Fix a 400 Error When Closing an Excel Session via Microsoft Graph API

Camila Milosovich Oct 19, 2026 870 views

Question details

The user encounters a 400 Bad Request error when attempting to close a remote Excel workbook session via a Microsoft Graph API call.

How to Fix a 400 Error When Closing an Excel Session via Microsoft Graph API

Product: Microsoft Graph API
Device & OS: not provided
Scenario: Closing an Excel workbook session using a POST request with a bearer token, workbook session ID, and an empty JSON body.
Observed behavior: The API endpoint returns a 400 Bad Request error instead of successfully terminating the workbook session.

Before you start

Ensure you have active developer access to your Microsoft Azure portal and verify that your Microsoft Graph API bearer authentication token has not expired.

Solution 1Recommended

Verify Graph API Endpoint and Request Headers

Check the core components of your HTTP request to ensure they precisely match Microsoft Graph API documentation requirements for closing an Excel session.

A 400 Bad Request error usually means the server cannot process the request due to a client error, such as malformed request syntax, invalid parameters, or missing required headers.

Check the Endpoint URL

Verify that your POST request is directed to the exact endpoint: https://graph.microsoft.com/v1.0/me/drive/items/{id}/workbook/closeSession.

Validate the Session ID Header

Ensure you are passing the workbook session ID in the headers using the exact key 'workbook-session-id', rather than placing it in the JSON body.

Confirm Bearer Token Status

Check your authorization header to ensure it contains 'Bearer {your_token}' and that the token has sufficient write permissions for the target drive item.

Review JSON Body

Make sure your request body is completely empty or properly formatted as an empty JSON object '{}' if required by your HTTP client.

Verify Graph API Endpoint and Request Headers

Session ID Requirements: The 'workbook-session-id' header is strictly required for this specific API call to identify which active session needs to be terminated.

Solution 2

Seek Assistance in the Microsoft Graph Users API Community

If standard parameter verification fails, escalate the issue to the specialized Microsoft developer community, as this is a backend API issue rather than a standard Excel client error.

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Frequently Asked Questions

What causes a 400 Bad Request error in Microsoft Graph API?

A 400 error indicates a malformed request syntax. For Excel workbook sessions, this usually happens if the endpoint URL is misspelled, the 'workbook-session-id' header is missing, or the JSON body is formatted incorrectly.

How do I correctly pass the workbook session ID in my API request?

The workbook session ID must be included in the HTTP request headers using the exact key 'workbook-session-id'. Do not put the session ID inside the payload body when closing a session.

Is it possible to automate WPS Spreadsheet tasks using the Microsoft Graph API?

No, the Microsoft Graph API is designed exclusively for Microsoft 365 cloud services. However, WPS Office offers its own comprehensive automation capabilities through macros, VBA (in premium versions), and Python integrations depending on your setup.

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