Power Automate - Does not Work - However Postman does

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Posted on by SÖ-17061501-0

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Hello dear Community,

A customer who does use Power Automate does have got troubles sending Requests with it.

So, the customer is able to send the Requests via Postman and he is getting answers.

However with Power Automate it does not work.

Does anybody something about a bug?

Is there a way to contact Microsoft?

Please a Link!

Thanks in Advance!

Categories:

Dynamics 365 general

Power Platform integration

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SÖ-17061501-0 230 on at

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Power Automate - Does not Work - However Postman does

The Problem was Microsoft. They had a bug, They fixed it. Stil thanks Community.

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DAnny3211 11,269 on at

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Power Automate - Does not Work - However Postman does

Hi,

Thanks for your question! If your customer is able to successfully send requests via Postman but not through Power Automate, here are a few things to check:

Authentication Differences:

Postman may be using a different authentication method (e.g., OAuth token manually added).

Ensure Power Automate is using the correct authentication type and that the connection is properly configured.

Headers and Body Format:

Compare the headers and body used in Postman with those in Power Automate. Even small differences (like missing Content-Type) can cause failures.

Error Details in Power Automate:

Check the run history of the flow and expand the failed step to view the exact error message. This can help pinpoint the issue.

Connector Limitations:

If you're using a built-in connector, it may have limitations compared to raw HTTP requests. Consider using the HTTP action in Power Automate for more control.

Contacting Microsoft:

You can raise a support ticket via the Power Platform Admin Center:
https://admin.powerplatform.microsoft.com/support

Let me know if this helps, and please mark the response as helpful if it answered your question.

Best regards!

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André Arnaud de Cal... 297,406 Super User 2025 Season 2 on at

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Power Automate - Does not Work - However Postman does

Hi,

Can you tell what exact connector and action is giving the error? Are you using the Dataverse, Fin&Ops or another connector?

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SÖ-17061501-0 230 on at

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Power Automate - Does not Work - However Postman does

@Adis

Thanks for your support.

However we as it seems we already got connected to the official Microsoft support for this case.

i am going to close this ticket.

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SÖ-17061501-0 230 on at

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Power Automate - Does not Work - However Postman does

@Adis

Hello Adis,

i am sorry that i did not give further information.

So the user can not send any requests. Nothing works.

However he is able to send Requests via Postman. They work.

He is getting the following Error:

{"title":"Proxy execute request error","status":400,"detail":"ms-plex-targetServiceUrl header must be a valid Absolute Uri.","instance":"/extension/proxy","serviceRequestId":"xxxxxxxx","exceptionSource":"InvalidProxyExecuteRequestException"}

So, is it possible that the power Plattform has a bug?

Thanks in Advance for the Support!

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Adis 5,449 Super User 2025 Season 2 on at

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Power Automate - Does not Work - However Postman does

Hi,

Could you share some details about the flow? Does it success or run into an error? If you have an error, please provide details.

You can raise a ticket via the Power Platform admin Center.

Kind regards, Adis

If this helped, please mark it as "Verified" for others facing the same issue

Keep in mind that it is possible to mark more than one answer as verified

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