Subdomain mapped to a subdirectoy site not working

I have a site in a subdirectory http://leadscoring.es/colombia and I want the subdomain htto://softline.kapturall.com to point to that site. I already configured the plugin and also de cname but it is not working. When I try to define the mapping in the plugin I get a message "domain name is unavialable to access".
DNS is propagated and seems to be OK.