Why does my iframe content not appear in the overlay?Last Updated: November 01, 2018
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Occasionally web pages cannot be placed into iframes due to restrictions placed on the page.
The X-Frame-Options HTTP response header can be used to indicate whether or not a browser should be allowed to render a page in a <frame>, <iframe> or <object>. Sites can use this to avoid clickjacking attacks, by ensuring that their content is not embedded into other sites.
Sites that have X-Frame-Options HTTP response header cannot be loaded into an iframe inside an overlay.
If you are the site owner of the page you would like to iframe into an overlay you could look into alternative methods of protecting your site such as frame-ancestors.