Some clients block being embedded due to X-Frame-Options headers. Instead of using an iframe, modify your selector to open the client in a new tab when you click a button ( window.open(url) ). Or, download a different build of that client that allows framing.
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. It proves that as long as there is a browser and a bit of code, the "blocks" will find a way to stay on the screen. Should we look into the current working links for the selector, or would you like to know how to host your own version privately?