Hi,
I tested with both root and www and they both work fine. I think it may be something with your local PC's DNS configuration that is causing the issue. Or perhaps you made a change and it took some time to take effect.
EDIT: Looking at the errors at the bottom of your screenshot, it appears there was DNS propagation delay that is okay now. Azure thought you didn't have necessary DNS records but I checked from my machine and they are correct.
Please test from completely different device and Internet connection and see if it is working okay. For example, use your mobile phone browser with wifi disabled so it uses mobile data connection.
-TP