Multiple WPMU DEV Dashboard User Access

Hi there, I've made changes to the site wp-config.php file to achieve this:

Only the admin users "square", "Jin Koo Kim" have access to the WPMU DEV Dashboard plugin and features on this site.

But when logging in as Jin Koo Kim I still cannot see the WPMU DEV Dashboard.

Please help. It's important that both me and my colleague can have equal view and access to the WPMU DEV installs on all our client websites.