I have tried integrating LinkedIn Auto fills on this page,

I have tried the steps from this URL: https://community.unbounce.com/tips-scripts-43/how-to-add-a-linkedin-autofill-button-to-your-landing-page-6843

I could see linkedIn button on the form lading page but when I click on the LinkedIn button it shows “Pagenotfound”

Some screenshots for reference:
https://postimg.cc/9RcG0bVz

any easy fix here?