domain mapping a subdomain to an actual domain name

working with wordpress multisite and domain mapping. No problems when creating a new site. default is set up to create a subdomain, and then would use domain mapping to go to an actual domain name. New site create just fine, I then go to Tool > domain mapping, enter a domain name after the "http://" and then click the "map domain" button. it works, but I get an "invalid" under "health status" :slight_frown: any ideas on how to fix this?? thx