help me to create a iframe for my-account page

I want to make a iframe for demo1.com/my-account in beta.demo2.com, but it said demo1.com refused to connect. so that I added bellow code in demo’s config file and it just help me to show the login form but I can’t login! it’s seems after submit the login form it just reloaded. It got blocked somewhere! Can you help me with it?

header('X-Content-Security-Policy: frame-ancestors https://.demo2.com'); header('Content-Security-Policy: frame-ancestors https://.demo2.com');

Thank you!