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Power Automate Desktop - Send a x-www-form-urlencoded Body - OAuth 2 client_credentials authentication

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Posted on by Marcel3

Hello everyone,

I'm trying to authorize using OAuth 2 client credentials authentication. It works perfectly fine using postman, but when I try to send the request using Power Automate Desktop. (so credentials are fine)

I always get an error saying that required params in the body are missing.

For my understanding the request is not correctly formatted for the message format x-www-form-urlencoded.

My request

The response I get:

Bildschirmfoto 2021-12-05 um 11.29.00.png

Can anyone help me out? How do I format the body of my request correctly?

Thank you!

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Power Automate Desktop

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Marcel3 12 on at

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Setting the body to grant_type=client_credentials doesn't work either
MichaelAnnis 5,727 Moderator on at

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Try using command line.

Here’s a post: https://developer.okta.com/blog/2018/07/16/oauth-2-command-line
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yoko2020 495 on at

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Here is an example of request body for azure key vault called from power automate desktop invoke web service.

grant_type=client_credentials&client_id=%keyVaultClientId%&client_secret=%keyVaultClientSecret%&scope=https://vault.azure.net/.default
Marcel3 12 on at

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Thank you, both solutions should work although I prefer @yoko2020 solution as it is integrated in Power Automate Desktop. In my case I found out that the receiving API is broken ....