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-EDIT-

Also tried passing the post_type as an array

'pages'      => array('team'), // Post type 

-EDIT-

I am also trying like this:

$meta_boxes[] = array(
            'id'         => 'team_details',
            'title'      => 'Team details',
            'pages'      => 'team', // Post type    
            'context'    => 'normal',
            'priority'   => 'high',
            'show_names' => true, // Show field names on the left
            'fields'     => array(
                array(
                    'name' => 'Subtitle',
                    'desc' => 'This is the subtitle',
                    'id' => $prefix . 'subtitle',
                    'type' => 'text'
                ),
            ),
        );

Edit: In case you Didn't notice I've never done this before. I am following this steps with no succeed..