Action 'HTTP_Request_-_Form' failed: Unauthenticated.

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Posted on by PeterMarshall19

Im having an issues with this flow authentication, i really dont understand what im doing wrong?

Can anyone help, im really new to this

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PeterMarshall19 10 on at

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rzaneti 4,476 Super User 2026 Season 1 on at

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Hi,

Are you receiving the same error when you test it in a different platform (e.g. Postman)? If you don't find any errors in this scenario, I would recommend you to investigate any headers used by Postman that could be required for this request, and replicate them in Power Automate.

Another option is to disable the new designer in Power Automate and recreate your HTTP action. Although we had a lot of improvements in the new designer during 2024, it still has a few minor bugs.

Let me know if it works for you or if you need any additional help!

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PeterMarshall19 10 on at

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Hi Rzaneti,

It works finr in Postman but not on here, im a total newbie at this. I only know it works in Postman due to someone testing it for me.

I haver just redisgned the new http request not using new designer, ill re-run and see if this works

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eliotcole 4,390 Moderator on at

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Hi, Peter (sorry, I cannot at you)

Can you try sending the 'HTTP Request - Form' action with the method set to:

POST

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David_MA 14,605 Super User 2026 Season 1 on at

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You may want to refer to Introduction – Lumiform Public API to see how to authenticate. The problem isn't necessarily an issue with Power Automate since you are sending an HTTP request to another service. According to the information on the Lumiform site, you do not have a valid key based on the error you are getting (Unauthorized). The link above will tell you how to obtain a key and apply it to your HTTP request.

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rzaneti 4,476 Super User 2026 Season 1 on at

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Hi Peter,

I checked the Lumiform documentation (thanks David for sharing it!!) and it looks like you are missing the Content-Type header. You can fix it to simply adding Content-Type application/json to your headers, such as highlighted below:

Let me know if it works for you or if you need any additional help!

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PeterMarshall19 10 on at

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Hi @rzaneti and @David_MA,

The flow on the left is one that used to work and the one on the right is the one not working, below the "Actions section you can see this has changed. How do i change that?

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eliotcole 4,390 Moderator on at

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Have you tried changing the method from GET to POST, yet?

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PeterMarshall19 10 on at

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Hi All,

I tried everything below and still not working.

In the end i built it from scratch again in the old builder and it worked so not sure what the issues was

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