"invalid" domain status

Hi. I'm getting an "invalid" domain status for a domain that I've mapped. It's a valid domain, it's configured exactly the same as another domain that I've mapped to the same site that's not giving me any problems. (domain mapping plugin).

I've fixed the glue records but I'm still getting that invalid status. I've tried removing the domain and adding it back in again but no joy.

https://serverfault.com/questions/677012/how-can-i-fix-superfluous-name-server-listed-at-parent-on-producaoaudio-com