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When a HTTP request is received error 503 service unavailable


I'm currently having a problem with a flow.

I'm linking a Splunk alert set to webhook call to a Power Automate flow that parse the JSON payload to get the data and finally send a message in a Teams chat room with the data. I use the "When a HTTP request is received" trigger for my automated cloud flow.


It looks like that :






The JSON schema works perfectly fine.

The Splunk alert is triggered but in the logs it says :
STDERR - Error sending webhook request: HTTP Error 503: Service Unavailable


The flow works with a POST call in Postman (from my laptop to power automate).


More weird is that it was working perfectly fine a week ago.


Any idea why the 503 error ? It may come from Splunk but I'm not sure


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