After setting the following to "lock," it's still possible to create an identity of "unnamed" by selecting the "select identity" option. Maybe I missed something instead???..... // default identity // Set locked to true if you don't want the users to have multiple identities. $_prefs['default_identity'] = array( 'value' => 0, 'locked' => true, 'shared' => true, 'type' => 'implicit' );