Following with the cloud deployment guide till can't access the custom domain

Technical Help
#1

I was following the AWS/Docker guide and got stuck at the custom domain. When I try to access the URL via https://...... , the prompt asks for username and password.

What is the expected behavior? Should it not show a prompt if I had set it up properly?

#2

Just enter the credentials you set as HOUSTON_USERNAME and HOUSTON_PASSWORD in this section: Installation Tutorial for Cloud