Power Automate URL Error

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Posted on by NK-01042119-0

Current Power Automate URL is a direct workflow endpoint and requires OAuth. Either:
1) set environment variable POWER_AUTOMATE_BEARER_TOKEN, or
2) replace POWER_AUTOMATE_URL with the signed HTTP trigger URL from the flow.

Trying to set up workflows to send a teams msg thru power automate. I have a Power Automate flow using "When a Teams webhook request is received" that posts to a Teams group chat.

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Sunil Kumar Pashikanti 2,097 Moderator on at

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Hi @NK-01042119-0,

This error happens because you’re calling a secured Power Automate workflow endpoint that requires OAuth.
For Teams messaging from Power Pages, you should use the Webhook URL generated by the “When a Teams webhook request is received” trigger.
That URL is already signed and does not require OAuth. Copy the webhook URL from the trigger after saving the flow and use that instead.

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

Replacing Legacy Microsoft Teams Webhooks with Power Automate Workflows – Haifeng's Blog

Create & Send Actionable Messages - Teams | Microsoft Learn

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11manish 2,716 on at

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In Power Automate, your issue is caused by using the wrong flow endpoint.

Problem

You are calling a direct workflow endpoint

This requires OAuth (Bearer token)

Not suitable for webhook scenarios

Solution
Use the signed URL from the trigger:

“When a Teams webhook request is received”

This URL includes a signature (sig)

No OAuth required

It looks like:

https://prod-XX.westeurope.logic.azure.com/.../triggers/manual/paths/invoke?...&sig=XXXXX

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