The error is
EikonError: Error code 404 | Client Error: <!DOCTYPE html>
<pre>Cannot POST /api/v1/data</pre>
@kaustubh the API Proxy is built into the Eikon terminal - we are just trying to check whether your Eikon terminal can access the Eikon Data API. (Eikon Core and Eikon for Exchanges variants do not have access to the Eikon Data API) - is the subscription the same email address as the one you used to register on this portal?