Rails Hello World Returning Backend 404

Following this tutorial, https://www.youtube.com/watch?v=u3jFf3tTtMk,

I have mapped my ingress endpoint to http://mudah.amiyn.com. Whether using the ingress IP, or my domain URL, 34.68.80.239, the 404 returns. I am fairly new to Gitlab, Kubernetes, and GKE, so I am not sure what all will be helpful to provide. Please advise.

The project I forked for this is : https://gitlab.com/auto-devops-examples/minimal-rails-app
After that, I followed everything verbatim from the tutorial.