Nginx proxy mgr not redirecting as expected

I’ve just installed the Nginx Proxy Manager, and configured a proxy host to direct traffic to one of my other domains to a web server on another machine.

However, when I try to access that URL I get this message, rather than being redirected to the web server on 192.168.1.36:

Congratulations!

You’ve successfully started the Nginx Proxy Manager.
If you’re seeing this site then you’re trying to access a host that isn’t set up yet.
Log in to the Admin panel to get started.

Any idea what I’ve done wrong here?