Uploading a file to OneDrive via Graph API is unauthenticated

Question

I referred to this document for uploading files: https://learn.microsoft.com/en-us/graph/api/driveitem-createuploadsession?view=graph-rest-1.0. I was able to successfully obtain the upload URL.

When testing with my personal OneDrive account, I obtained the following URL: https://api.onedrive.com/rup/XXXXXXXXXXXXXXXXXX. At this point, I could upload without any issues.

However, when obtaining an upload URL for other users' OneDrive, I received: https://xxxxxx.sharepoint.com/personal/xxxxxxxxxx/_api/v2.0/drive/items/xxxxxxxxxxxxx. Upon attempting to upload, I encountered the error message: "401 Unauthenticated, this access token is not valid on this endpoint."

I am certain that I did not include any authorization headers when sending the PUT request. Could you please advise on any missing settings or provide other suggestions for reference?

Answer 1

Hi @Ryan Lin,

For 401 Unauthorized error, Please make sure that your application is presenting a valid access token to Microsoft Graph as part of the request. This error often means that the access token may be missing in the HTTP authenticate request header or that the token is invalid or has expired. We strongly recommend that you use the Microsoft Authentication Library (MSAL) for access token acquisition. Additionally this error may occur, if you try to use a delegated access token granted to a personal Microsoft account, to access an API that only supports work or school accounts (organizational accounts).

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.