Responsive Embed refusing to connect to URL?

I am using responsive embed.

I get the following error.

The url I am using works fine on its own but not when using responsive embed, I have tried removing www and all sorts etc...

Still does not work.

Only site I can get working is bootstrapstudio.io I can't even get google.com to load in the responsive embed, I don't know why...?

I also tried in edge which gives me:

"...the publisher doesn't allow it to be displayed in a frame..."

That should answer your question pretty much. You'll probably need to get permission as well as a special copy of it in order to allow it to be in an iframe, or talk to the Publisher to see what they "do" allow and work around it.

Makes sense, thanks