Custom Login iframe doesn’t work

After doing some more research, I found this post: how can i embed wordpress backend in iframe. While the question it was asking didn’t relate, the answer that toscho gave did. I’m reposting it here so it can be associated without click through:

By default WordPress sends an HTTP header to prevent iframe embedding
on /wp_admin/ and /wp-login.php:

X-Frame-Options: SAMEORIGIN That’s a security feature. If you want to
remove this header remove the filters:

remove_action( 'login_init', 'send_frame_options_header' );
remove_action( 'admin_init', 'send_frame_options_header' );