CDN: Multiple instances of same Custom Domains
Currently CDN Portal doesn't allow deploying multiple Custom Domains with identical FQDN, even if you try doing this across different Subscriptions or CDN Profile SKUs.
You get a deployment error:
Couldn't create CDN custom domain
We couldn't create your custom domain. Another custom domain with the same host name already exists.
This feature would come useful for deployment scenarios where you want to distribute your Origins Globally, closer to every region.
In other words, have multiple overlays of CDN instances with the same Custom Domain.