Problem setting up Domain Mapping

I am trying to set up multisite with domain mapping. I've never done this before.

I've set up a multisite on a dedicated IP of

I've set it for subdirectories rather than subdomains.

I've uploaded the domain mapping plugin, copied the sunrise.php file to wp-content and added the sunrise definition to the wp-config.

I've changed the A records on the domain I'm trying to map ie to point to

I go back into WordPress and add the mapping to
the moirajenkins site but it comes back domain name is unavailable to access.If I put it in anyway it does not work and shows as invalid.

I'm not sure where to go from here?