Back in 2014 I wrote this post about the fiddly side of configuration when adding a custom domain in Azure.
Since then Azure has come a long, long, long, long way and this has been fixed, improved, reworked...hell it's just so much better.
You get better feedback, more useful and accessible information and it just works.
Nothing more to say really other than that. It just works well as does everything I use on Azure these days.
Keep up the great work Microsoft