Refused to display 'https://www.google.com/' in a frame because it set 'X-Frame-Options' to 'sameorigin'.

Hello,

This means that website policy doesn't allow to display it as an IFrame of another website. 

Unfortunately, there is nothing we can do on our end to allow this website to be added to the dashboard.

You need to contact the administrators of the website directly and ask them to allow adding their website as an IFrame to other websites.