Send HTTP request to SharePoint failed due to Unauthorized error

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Posted on by CU12091103-0

Hi there,

I created a flow using the 'Send an HTTP request to SharePoint' action to download a file from Forms and then create a file in SharePoint. A few days ago, this flow worked well, but today it failed due to an 'Unauthorized' error, and in the output, I saw that the user was required to log in.

I already checked the connection for this action, and it is still active. I cleared the cache, deleted the entire flow and the connections, and recreated everything, but it still didn't work.

When I copy the output source and paste it in the browser, it works fine, but within the flow, it doesn't.

Does anyone know what might be causing this?

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Building flows

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Michael E. Gernaey 53,433 Super User 2025 Season 2 on at

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Hi

Just understand, you putting it in a browser is not a way to validate a login, since you are logged into your browser, so I would expect it to work.

If you change the connection or the connection reference does it start working again?

If you do a Save As to make a copy does the copy give the same error and in the copy change the connection and see if it fixes it.

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Orlarez 8 on at

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Hello, In my case the error that is generating the failure in my flow is { "status": 400, "message": "Unexpected response from the service\r\nclientRequestId: XXXX-4fb7-9362-8be53c", "error": { " message": "Unexpected response from service" }, "source": "sharepointonline-cus.azconn-cus-001.p.azurewebsites.net"} but when I run it in my browser it works fine. I appreciate any help in resolving it.

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CU12091103-0 23 on at

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Hi FLMike,

I also created a new connection directly in my flow and saved it as another flow, but it still didn't work. I've seen many posts about issues with sending HTTP requests to SharePoint from Forms these days, so I'm not sure if this action is no longer allowed

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AF-27090823-0 2 on at

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I too have a few flows that use the Send HTTP request to gather responses to Forms submissions which have been working for a couple of years, then suddenly all fail with the same error - Unauthorised, "Required user login."

I have tried recreating the connection to SharePoint, getting a colleague to edit the flow with his credentials, and even creating a new flow from scratch.

This is causing me a great deal of manual work, I would be really grateful if anyone has a solution.

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