OneDrive File Issues

Fix OneDrive Uploads Blocked After a Failed Excel File Upload via API

Huma Ashraf Ch Sep 27, 2026 869 views

Question details

Users experience a 30 to 40-minute block on subsequent OneDrive API uploads after a single Excel file fails to upload due to unsupported components or local drive references.

Fix OneDrive Uploads Blocked After a Failed Excel File Upload

Product: OneDrive for Microsoft 365
Device & OS: not provided
Scenario: Uploading Excel files to OneDrive via an Azure Functions C# API.
Observed behavior: After an upload fails due to an unsupported Excel component or a shared path referencing the C: drive, all later API uploads are blocked for 30 to 40 minutes.

Before you start

Gather your API request details, service logs, error codes, and exact timestamps of the failed uploads before proceeding to contact support.

Solution 1Recommended

Collect API Logs and Submit a Microsoft 365 Support Request

Since an unsupported Excel component should not trigger a 30-minute upload block, this unexpected behavior requires investigation by Microsoft service teams.

Server-side locks resulting from unsupported file components or invalid local path references (such as the C: drive) are not expected behavior in the Microsoft Graph or OneDrive APIs. Because this is a backend service issue, it must be resolved by the relevant Microsoft support team using your diagnostic data.

Gather Diagnostic Data

Collect timestamps, request headers, error responses, file information, and Azure Functions service logs related to the failed Excel upload.

Access the Admin Center

Open a Support Ticket

Navigate to the Support section, click on 'Help & support', and submit a new service request detailing the API upload block.

Provide Reproduction Details

Attach the collected logs and provide exact steps to reproduce the issue so the service team can investigate the locking mechanism.

Collect API Logs and Submit a Microsoft 365 Support Request

Administrator Privileges Required: If you are not a Microsoft 365 administrator, you will not have access to the support portal. Please contact your organization's IT administrator to submit this request on your behalf.

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Frequently Asked Questions

Why does my C# API fail to upload certain Excel files to OneDrive?

Uploads can fail if the Excel file contains unsupported components or references a local shared path (like the C: drive) that the cloud service cannot resolve during the upload process.

How long does the OneDrive upload block typically last?

Users report that after a failed API upload triggers this issue, subsequent API file uploads appear to be blocked for approximately 30 to 40 minutes before recovering.

Can I programmatically bypass the 30-minute OneDrive upload lock?

No. Because this is an unexpected server-side behavior in the Microsoft 365 environment, there is no direct API bypass. You must wait for the lock to expire or contact Microsoft support to investigate the throttling or locking mechanism.

Document & File Issues