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How to Troubleshoot Yammer API 404 Error Uploading Files

Olivia Miller Oct 19, 2026 868 views

Question details

The user is encountering a 404 Not Found error when executing a PowerShell script to upload files via the Yammer API.

How to Troubleshoot a 404 Error When Uploading Files with the Yammer API

Product: Yammer API
Device & OS: not provided
Scenario: Uploading a small image file using a PowerShell script with Invoke-RestMethod, a Bearer access token, and the /api/v4/uploadsmallfile.json endpoint.
Observed behavior: The API request fails to process the file upload and instead returns a 404 error.

Before you start

Verify that your PowerShell environment has correct execution policies enabled and double-check that your Bearer access token is valid and unexpired before investigating the API endpoint.

Solution 1Recommended

Seek Assistance in the Microsoft Graph Q&A Community

Since this is a custom API integration issue rather than a built-in Yammer feature problem, escalating to the dedicated Microsoft Graph developer community is the recommended path.

Standard Yammer support channels focus on built-in user interface features and general troubleshooting. Because your issue involves PowerShell scripts, Invoke-RestMethod, and specific API endpoints, you need specialized developer assistance.

Gather your script details

Collect your complete PowerShell script, focusing on the authentication method (Bearer token), the API endpoint used (/api/v4/uploadsmallfile.json), and the exact 404 error response output.

Visit the Microsoft Q&A community

Navigate to the Microsoft Graph Q&A community page at https://learn.microsoft.com/en-us/answers/tags/161/ms-graph.

Post your issue for investigation

Create a new thread detailing your scenario. Include your request format and error logs so the relevant Microsoft engineers can test the endpoint and identify if the route has been changed or deprecated.

Seek Assistance in the Microsoft Graph Q&A Community

Provide Comprehensive Details: Make sure to obscure any sensitive data, such as your actual Bearer token, before posting your script in the public Q&A forum.

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Frequently Asked Questions

Why does the /api/v4/uploadsmallfile.json endpoint return a 404 Not Found error?

A 404 error typically indicates that the endpoint URL is incorrect, has been deprecated, or requires different routing parameters. Microsoft frequently updates API routes, so verify your endpoint against the latest official Microsoft Graph developer documentation.

Are there standard troubleshooting steps for PowerShell API requests?

Yes. Before assuming the endpoint is broken, ensure your Bearer access token has sufficient write permissions, verify your headers (especially Content-Type for multipart/form-data), and test the API route using a tool like Postman to isolate script errors from server errors.

Does standard Microsoft support cover Yammer API scripts?

No, standard Yammer support primarily handles the built-in UI and feature troubleshooting. For custom scripts, authentication flows, and API integrations, users must consult the Microsoft Q&A community under the ms-graph tag for specialized assistance.

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