API addDiscovery doesn't work

API addDiscovery doesn't work

Dear experts,


Results is
<body>
    <h1>HTTP Status 404 – Not Found</h1>
    <hr class="line" />
    <p><b>Type</b> Status Report</p>
    <p><b>Message</b> Not Found</p>
    <p><b>Description</b> The origin server did not find a current representation for the target resource or is not
        willing to disclose that one exists.</p>


Please advise, what's wrong?

Thank you

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