Mapped domains doesn't work with WWW

Hi, and thanks in advance for your support.

We are using the Domain Mapping plugin to maps domain on our installation in http://www.sistemago.com on WP Engine install.

Every domain we mapped on every sub site doesn’t work if we write it with the WWW

Works well with http://misite.com/

Not working with http://www.misite.com

For example… Taking a look around we are seeing that http://www.eduardotapias.com does redirect properly to eduardotapias.com. And taking a look at the domain mapping settings is does look like this subsite is set to load over the non-WWW domain, but we are not seeing the option to change this to the WWW version

This is a domain mapped into http://www.sistemago.com/eduardotapias

We need to solve this very urgently because our users are complaining about the error.

Thanks in advance