CPT Taxonomy As Archive Page – Error 404

Question

I have a CPT called Clubs. To 'categorise' posts depending on if clubs are in the same league or cup competition (or neither), I also have a custom taxonomy called Opposition.

To show which clubs are in either the same competition, I am trying to create a page that functions like an Archive page where these specific Clubs posts are displayed: /clubs/opposition/

To do this, I've created a taxonomy-opposition.php template file and edited the functions.php file with the following:

// Clubs Post Type
function clubs_init() {
    $labels = array(
        'name' => 'Clubs',
        'singular_name' => 'Club',
        'add_new' => 'Add New Club',
        'add_new_item' => 'Add New Club',
        'edit_item' => 'Edit Club',
        'new_item' => 'New Club',
        'all_items' => 'All Clubs',
        'view_item' => 'View Club',
        'search_items' => 'Search Clubs',
        'not_found' =>  'No Clubs Found',
        'not_found_in_trash' => 'No Clubs found in Trash', 
        'parent_item_colon' => '',
        'menu_name' => 'Clubs',
    );
    $args = array(
        'labels' => $labels,
        'public' => true,
        'has_archive' => false,
        'show_ui' => true,
        'capability_type' => 'post',
        'hierarchical' => false,
        'taxonomies'  => array( 'clubs', 'opposition' ),
        'query_var' => true,
        'rewrite' => array(
            'slug' => 'clubs',
            'with_front' => false
        ),
        'menu_icon' => 'dashicons-shield',
        'supports' => array(
        'title',
        'editor',
        'excerpt',
        'trackbacks',
        'custom-fields',
        'comments',
        'revisions',                
        'thumbnail',
        'author',
        'page-attributes'
        )
    );
    register_post_type( 'clubs', $args );
}
add_action( 'init', 'clubs_init' );

// Opposition Taxonomy
function opposition_taxonomy() {
    $labels = array(
        'search_items'      => 'Search Opposition',
        'menu_name'         => 'Opposition'
    );
    register_taxonomy( 'opposition', 'clubs', 
    array(
        'hierarchical' => true,
        'labels' => $labels,
        'query_var' => true,
        'show_admin_column' => true,
        'has_archive' => true,
        'rewrite' => array(
        'slug' => 'clubs',
        'with_front' => false
    ),  
) );
}
add_action( 'init', 'opposition_taxonomy' );

The result when I try to access /clubs/opposition, though, is an Error 404. The thing baffling me is that I've done something similar for my Players CPT, creating a custom Squad taxonomy page that does display. And I've followed exactly the same steps in trying to create an Opposition page.

(I have flushed the permalinks)

I've referred to existing questions, but so far haven't found the solution:

• Custom taxonomy archive page not working
• Custom taxonomy template not working
• custom taxonomy - Template not working
• Taxonomy page returns 404 page not found

Answer 1

You use the same slug clubs to register your custom post type and in rewrite when you register opposition taxonomy.

Change rewrite parameter in register_taxonomy()

'rewrite' => array(
    'slug' => 'clubs/opposition',
    'with_front' => false
),

The recognizable address will be clubs/opposition/{some-term-name} and will display posts from custom category.

However, the clubs/opposition address will still not work without additional code.