I'm trying to register a custom posttype and custom post type taxonomy. But when I create a term and click the button "view" to see the custom taxonomy page it returns a 404. I've tried resaving the permalinks a 1000 times, doesn't work.

function build_blog_post_type() {
        register_post_type (
            array (
                'labels'=> array (
                    'name'                      => 'Blog',
                    'singular_name'     => 'Blog bericht',
                    'add_new_item'      => 'Blog bericht toevoegen',
                    'add_new'                   => 'Blog bericht toevoegen',
                    'all_items'             => 'Alle blog berichten'
                'public'        => true,
                'menu_position' => 2,
                'menu_icon'   => 'dashicons-id-alt',
                'supports' => array('title'),

        array (
            'label'                 => 'Welke taxonomy',
                'name'                  => 'Welke taxonomy',
                'singular_name' => 'Welke taxonomy',
                'edit_item'     => 'Bewerk taxonomy',
                'add_new_item'  => 'Nieuwe taxonomy toevoegen',
                'menu_name'     => 'Welke taxonomy',
                'show_in_nav_menus' => false,
                'public'                => true,
    add_action('init', 'build_blog_post_type');

URL I'm trying to acces: mydomain.test/blog_taxonomy/test-taxonomy

I have an 404.php with a specific main ID and a index.php with its own specific main ID, so I can easly see which is returned. There is no indication index.php is used

  • 1
    Could you post an example link you are using to access the taxonomy? Commented Mar 10, 2020 at 14:44
  • @WacławJacek I'm using the "view" button in admin, it gives me: mydomain.test/blog_taxonomy/test-taxonomy
    – mhaklander
    Commented Mar 10, 2020 at 14:45
  • Are you sure it is a 404 error? Maybe the taxonomy link is working correctly and there just are no posts in that taxonomy? Commented Mar 10, 2020 at 14:55
  • @WacławJacek yes definitely. It even renders my custom 404 page.. :(
    – mhaklander
    Commented Mar 10, 2020 at 14:56
  • Do you have a custom 404.php template or is your index.php catching 404 errors? In the latter case, it is possible that if you do not have a taxonomy page template, WordPress is displaying the index.php file containing a "404 error" message instead. Commented Mar 10, 2020 at 14:59

1 Answer 1


I've found my solution.. In my functions.php I found the following functions which returns a 404 on several types:

  function remove_wp_archives(){
    //If we are on category or tag or date or author archive
    if( is_category() || is_tag() || is_date() || is_author() || is_tax() ) {
      global $wp_query;
      $wp_query->set_404(); //set to 404 not found page
  add_action('template_redirect', 'remove_wp_archives');

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