Can't pass value from URL parameter to embeded form via iframe

If using https://form.jotform.com/210521095089049?agent=yes is working fine but it's not working on my site https://www.hartamas.com/affiliate/index.html?agent=yes.

Please assist.

As reference for others, I found the solution at https://help.salesforce.com/articleView?id=000317377&type=1&mode=1

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