Error: 401 - FileOpenUserUnauthorized - Graph API

Question

When I make a request to this endpoint in the doc then ı get the following error and ı am sure, ı have the necessary "permissions" for the request.

Error and Message:

• Error: 401 - FileOpenUserUnauthorized
• Message: You do not have permissions to open this file in the browser.

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I did some research and the same problem is mentioned in forums here:

• https://learn.microsoft.com/en-us/answers/questions/1656673/error-401-fileopenuserunauthorized-graph-api-onedr
• https://learn.microsoft.com/en-sg/answers/questions/1624742/fileopenuserunauthorized-error-for-excel-api

Answer 1

I had the same problem. I solved it by accessing One Drive, then opening the Excel file in the browser. Then I called the /workbook/worksheets API and it worked. I also had the problem of the /search api returning an empty list. And I tried searching for a file by keyword on the One Drive web (remember to press Enter to display the results). And this api also worked again.

Answer 2

This is still a problem on 24th July 2025!!!!!!!

do something Microsoft! Stop layoff and start hiring.