If adding the meta data using CB Auto Actions ensure you're acting on the gj_onAfterDisplayGroup trigger. Its variables are as follows.
Code:
$_PLUGINS->trigger( 'gj_onAfterDisplayGroup', array( &$return, $row, $users, $invites, $user ) );
$row is the group object. So you'll need to use [var2_name] for the group name using that trigger.