This approach was working fine for me, but then after a period of not using it it stubbornly stopped working. (Probably due to some updates.) After much head banging I was able to make it go be using the Port Forwarding as described in the article above. (https://developers.google.com/web/tools/chrome-devtools/debug/remote-debugging/remote-debugging#remote-debugging-on-android-with-chrome-devtools)
This approach also has the advantage of using localhost for both running in the browser and running on the phone avoiding constantly tweaking the server URL.