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HTTP action works with GET but returns error with POST

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Posted on by julienvdc

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Hey I am trying to run some API calls with PowerAutomate but I can't find what the issue is with my POST request. Prior to PowerAutomate I did my tests in Postman and both POST and Get requests are working fine. When I try the same setup in PowerAutomate, only my GET calls are working... for the POST I get some unauthorized response...

Am I missing anything specific to add in a POST request?

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Ellis Karim 12,059 Super User 2026 Season 1 on at

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We need more details to help you! Please share a screenshot of your flow, showing the configured actions. If there’s an error, tell us which action failed and include the error message. This will help us understand the issue and provide a solution faster. Thank you!

What is the endpoint you are connecting to?

Your flow may need an App Registration. Please see this: (4) All You Need to Know About Azure App Registration for Power Automate Workflows | LinkedIn

Ellis Karim
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MichaelFP 1,999 Moderator on at

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If you get 401, unauthorized it means that this HTTP Verb POST,must required the authentication, check with the team who develop or with the third-party company to get access to this request. Maybe you need a key or a client secret and id to make the request.

Only with a few information that you provided is not enough to help unfortunately.

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julienvdc 208 on at

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ah thanks, I'll look into the app registration, that might be it.

We're connecting to a 3rd party site through OAuth (client ID and Secret), thought the token was enough as the GET was working... but maybe I need to do some registration...

Thanks I'll look into it and report back!

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