mu domain mapping

Hi, I must be missing something basic.

My multisite has two sites, the main site and a clone which I want to have it’s own domain.

Attached are screenshots from the set up on the host, and in wp. What am I missing or doing incorrectly?

Thanks!!

https://screencast.com/t/TvMYgljVae shows the set up in wp
https://screencast.com/t/ULkGSdgn shows the set up for the addon domain
https://screencast.com/t/kYmLGZkybS shows domain mapping
https://screencast.com/t/3AtpCUyuy shows the active domains on this blog.