Issue sending webhooks to Microsoft Power Automate

I am trying to setup a Power Automate workflow to use with Zoom app webhooks. I am unable to get the workflow to receive the URL validation request when sent from Zoom.

The workflow is set up to trigger when receiving a POST webhook from Zoom, and if the event type is “endpoint.url_validation” then it will return the encryptedToken needed for validation.

I can get the workflow to trigger fine if I manually simulate the validation request using Postman, but when I send the validation from Zoon it does not even trigger the workflow to start, which tells me the request probably isn’t being set at all.

I can see lots of articles of people with the same issue but can’t find a solution that works. One person suggested changing the ‘%2F’ values in the URL back to ‘/’, which again works in postman but made no difference from Zoom.

Can anyone advise what’s going wrong here?

Thanks

This turned out to be due to Power Automate not liking multiple authorisation headers being present in the Zoom validation request. Changing to a custom authentication header resolved the issue.

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