Trying to use 'filter by view' to limit terms to those with a certain parent

I have a view that generates a list of terms under a given parent. The preview of the view appears to return the results I'm looking for. (See below)

However - when using the filter by view option with term reference tree, no options are displayed on the node edit form. Could you help me figure out what I'm missing?
Thanks!

$view = new view;
$view->name = 'allowed_terms';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'taxonomy_term_data';
$view->human_name = 'Allowed Terms';
$view->core = 7;
$view->api_version = '3.0-alpha1';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view->new_display('default', 'Master', 'default');
$handler->display->display_options['access']['type'] = 'perm';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['query']['options']['query_comment'] = FALSE;
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['pager']['type'] = 'none';
$handler->display->display_options['pager']['options']['offset'] = '0';
$handler->display->display_options['style_plugin'] = 'default';
$handler->display->display_options['row_plugin'] = 'fields';
/* Relationship: Taxonomy term: Parent term */
$handler->display->display_options['relationships']['parent']['id'] = 'parent';
$handler->display->display_options['relationships']['parent']['table'] = 'taxonomy_term_hierarchy';
$handler->display->display_options['relationships']['parent']['field'] = 'parent';
$handler->display->display_options['relationships']['parent']['required'] = 1;
/* Field: Taxonomy term: Term ID */
$handler->display->display_options['fields']['tid']['id'] = 'tid';
$handler->display->display_options['fields']['tid']['table'] = 'taxonomy_term_data';
$handler->display->display_options['fields']['tid']['field'] = 'tid';
$handler->display->display_options['fields']['tid']['label'] = '';
$handler->display->display_options['fields']['tid']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['tid']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['tid']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['tid']['alter']['external'] = 0;
$handler->display->display_options['fields']['tid']['alter']['replace_spaces'] = 0;
$handler->display->display_options['fields']['tid']['alter']['trim_whitespace'] = 0;
$handler->display->display_options['fields']['tid']['alter']['nl2br'] = 0;
$handler->display->display_options['fields']['tid']['alter']['word_boundary'] = 1;
$handler->display->display_options['fields']['tid']['alter']['ellipsis'] = 1;
$handler->display->display_options['fields']['tid']['alter']['strip_tags'] = 0;
$handler->display->display_options['fields']['tid']['alter']['trim'] = 0;
$handler->display->display_options['fields']['tid']['alter']['html'] = 0;
$handler->display->display_options['fields']['tid']['element_label_colon'] = FALSE;
$handler->display->display_options['fields']['tid']['element_default_classes'] = 1;
$handler->display->display_options['fields']['tid']['hide_empty'] = 0;
$handler->display->display_options['fields']['tid']['empty_zero'] = 0;
$handler->display->display_options['fields']['tid']['hide_alter_empty'] = 0;
$handler->display->display_options['fields']['tid']['separator'] = '';
$handler->display->display_options['fields']['tid']['format_plural'] = 0;
/* Filter criterion: Taxonomy vocabulary: Machine name */
$handler->display->display_options['filters']['machine_name']['id'] = 'machine_name';
$handler->display->display_options['filters']['machine_name']['table'] = 'taxonomy_vocabulary';
$handler->display->display_options['filters']['machine_name']['field'] = 'machine_name';
$handler->display->display_options['filters']['machine_name']['value'] = array(
  'tags' => 'tags',
);
/* Filter criterion: Taxonomy term: Term */
$handler->display->display_options['filters']['tid']['id'] = 'tid';
$handler->display->display_options['filters']['tid']['table'] = 'taxonomy_term_data';
$handler->display->display_options['filters']['tid']['field'] = 'tid';
$handler->display->display_options['filters']['tid']['relationship'] = 'parent';
$handler->display->display_options['filters']['tid']['value'] = array(
  1 => '1',
);
$handler->display->display_options['filters']['tid']['reduce_duplicates'] = 0;
$handler->display->display_options['filters']['tid']['type'] = 'select';
$handler->display->display_options['filters']['tid']['vocabulary'] = 'tags';