Need help with Domain Mapping.

I have a problem getting multisite with domain mapping to work. My base site is using a dedicated IP, the config.php settings are correct and I have added an A record of *.mydomain.club. Say I want to add a new domain to the network called domain2.club. I have added sites using My Sites > Network Admin > Sites. Constructed as domain2.mydomain.club. That works. Then when I go to the Domain Mapping plugin there is no option to map that subdomain to a real domain through the Domain Mapping plugin. I created an addon domain in the mydomain.club cpanel account and pointed the path to the public_html, but that made no difference.

Any help is appreciated.