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Graph api createUploadSession returns 401 on uploadUrl

teko 20 Reputation points
2025-06-09T12:56:00.0333333+00:00

Hello Microsoft Support,

Since 4 June 2025 (≈ 08:00 CEST) all large-file uploads via Microsoft Graph have been failing. createUploadSession still returns 200 with an uploadUrl, but the first PUT to that URL returns 401 Unauthorized even when no Authorization header is sent and the access token is valid. We made no code or tenant changes, and the issue affects every customer, blocking production uploads. This mirrors the EX1058997 incident from April. Please escalate, confirm whether a new service incident has been opened, and advise on an ETA or workaround. Correlation IDs and full request logs are available on request.

Microsoft Graph
Microsoft Graph
A Microsoft programmability model that exposes REST APIs and client libraries to access data on Microsoft 365 services.
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  1. Mohan Joshi-MSFT 660 Reputation points Microsoft External Staff
    2025-06-10T15:17:53.86+00:00

    Hi teko,

    Thank you for reaching out to Microsoft!

    We would like to inform you that the issue you are experiencing is part of a global outage currently affecting multiple users. Our engineering teams are actively working on a resolution, and a fix will be rolled out shortly.

    Hope this helps.

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

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