Wordpress on non standard port with Cloudflare Access

I have a Wordpress site that I am trying to publish using Cloudflare Access. The Origin server is a docker container on a NAS and is running on a non standard port (8192)

In the public hostname setting of the tunnel. I have Wordpress.domain redirects to ( Nas IP and Port)

I have used this successfully for other services.

When I then go to http://Wordpress.domain I get a redirect issued (presumably by Wordpress) and then the browser attempts to connect to http://wordpress.domain:8182