Punchout Test Connection gives error 204 (POR-2010665)

I am getting this error while trying to Test Connection on punchout catalog

A server side error occurred while connecting to the punchout site. The error code is 204. (POR-2010665)

here is my setup
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and this is the log
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The PunchOutSetupResponse cXML I am returning to Oracle:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><!DOCTYPE cXML SYSTEM "http://xml.cxml.org/schemas/cXML/1.1.007/cXML.dtd"><cXML payloadID="20250222043801.SessionId.78052@fa-eqwf-test-saasfaprod1.fa.ocs.oraclecloud.com" timestamp="2025-02-22T16:38:01.641Z">
<Response>
<Status code="200" text="success"/>
<PunchOutSetupResponse>
<StartPage>
<URL>//my_redirection_url</URL>
</StartPage>
</PunchOutSetupResponse>