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The OAuth authorization scheme is required. Please add authentication scheme and try again.

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Posted on by PhFranca

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Hey guys! I'm creating a flow, where I need it to start after pressing a button in Excel.
In some research, I found that we could create the flow "When an HTTP request is received" and then, select the method 'GET' and add, for example, a script.
However, I am having the error:

{
"error": {
"code": "DirectApiAuthorizationRequired",
"message": "The OAuth authorization scheme is required. Please add authentication scheme and try again."
}
}

Please, can you help me?
Thanks in advance!

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Building flows

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jsoroko 17 on at

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I had the same issue and found that you can set the first field "Who can trigger the flow" as "Anyone". When you save the flow it will provide a new URL that does not require authentication when used. If you copy the updated link and assign to the button it should work.
If you set the first field "Who can trigger the flow" to "Any user in my tenant" or "Specific users in my tenant" then this will require authentication. I do not know however, how to configure it yet.

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Dhiwakar 10 on at

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Even I am facing the same issue. Will anyone from Power Automate address this issue?

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PhFranca 103 on at

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Hello @jsoroko!
Worked perfectly!
Thank you very much for your help and time!

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PhFranca 103 on at

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Hello @Dhiwakar !
Hello! Follow @jsoroko's guidance, it worked perfectly for me.
Best of regards

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Dhiwakar 10 on at

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Helo @PhFranca
@jsoroko 's solution will work, but it will make your system easy target to denial-of-service attack. anyone who know the URL can hit it multiple times and make your system to go down. We need to authenticate the requests but we don't know how to achieve that with SharePoint button.

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PhFranca 103 on at

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@Dhiwakar Yes I agree with you. That's why I'm the only one who will use it.

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AlbertoCastro 1,201 Most Valuable Professional on at

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Hi,
anyone knows how configure the authentication to call the flow with this trigger from Postman?

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PhFranca 103 on at

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Hey,
Unfortunately I don't know.
PhFranca

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dkatzi 2 on at

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Hey Guys, I am struggling with the same issue.
The option "Anyone" is not accepted for my organisation.
We are working to make the option "Any user in my tenant" to work, testing with Postman for a start but we are failing.
What we have done so far is:
Created in Azure an Application Registration with a Certificate as credentials
Assigned to that Application Registration Power Automate permissions with the "User" option checked
Added the Certificate to Postman
But it still fails with the following error:
{
    "error": {
        "code": "DirectApiAuthorizationRequired",
        "message": "The OAuth authorization scheme is required. Please add authentication scheme and try again."
    }
}
If anyone has managed the "Any user in my tenant" authentication option to work, please help.

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AlbertoCastro 1,201 Most Valuable Professional on at

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Hi @dkatzi ,
using a client secret in the app registration I have a postman colletion with examples to call flows with this new security:
https://github.com/albertocastro365/Power-Automate/tree/main/Postman%20-%20Invocar%20Flows%20con%20HTTP%20Trigger
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Regards
Alberto

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