How to call Azure Logic app(standard) from Power Automate flow, facing 403 forbidden error

Question

Hello Everyone,

I have a use case to call Azure logic app(Standard) workflow from Power app/automate.
But on direct https call i am getting 403 error for testing i have kept public access open.

Although, i am able to call Logic app workflow from any browser directly. (it is automictically using certificate).
I am aware that there Power app customer connection is only available for logic app (consumption plan).

If there is not solution and I am planning to use and test APIM in between, but it would increate the complexity for single use case.
I did find some old post for connection but those doesn't work anymore(azure might have update the service now).

Any suggestions for direct call?

Answer 1

@Sharma, Ramavtar ,

Thank you for providing the details and the screenshot. I understand that you've already:

1. Enabled public access and removed all authentication from the Logic App.
2. Tried using the HTTP action in Power Automate without authentication, as shown in your setup.

Since the issue persists and the Logic App works fine in the browser (likely due to certificate authentication being used automatically there), the following steps might help further isolate or resolve the issue:

1. Ensure the signature (sig) query parameter in your Logic App URL is correctly included in the Power Automate HTTP action. This is critical for unauthenticated calls.
2. As a troubleshooting step, try calling the Logic App from tools like Postman or cURL using the same URL and settings configured in Power Automate. If this works, the issue might lie with how Power Automate is making the request.
3. Look at the Logic App runtime logs in the Azure Portal to confirm whether requests from Power Automate are reaching the Logic App and, if so, what’s causing the 403 responses.

If these steps don’t resolve the issue, you consider using intermediary like Azure API Management (APIM) to manage authentication and simplify the integration.