CPT Taxonomy category pages give 404

I built a CPT called case studies. Everything seems to be working correctly except when I try and visit the taxonomy category pages. When I try and visit them, I get a 404 error.

for example: https://www.mydomain.com/case-studies/categories/hospitality/

Here is my code used to register both the CPT and Taxonomy.

/*****************************************
 * Add custom post type for Case Study *
 *****************************************/

add_action('init', 'case_study_register');

function case_study_register() {

    $labels = array(
        'name' => 'Case Studies',
        'singular_name' => 'Case Study',
        'add_new' => 'Add New',
        'add_new_item' => 'Add New Case Study',
        'edit_item' => 'Edit Case Study',
        'new_item' => 'New Case Study',
        'view_item' => 'View Case Study',
        'search_items' => 'Search Case Study',
        'not_found' =>  'Nothing found',
        'not_found_in_trash' => 'Nothing found in Trash',
        'parent_item_colon' => ''
    );

    $args = array(
        'labels' => $labels,
        'public' => true,
        'publicly_queryable' => true,
        'show_ui' => true,
        'query_var' => true,
        'has_archive' => true,
        'rewrite' => array( 'slug' => 'case-studies', 'with_front' => false ),
        'capability_type' => 'post',
        'menu_position' => 6,
        'supports' => array('title', 'excerpt', 'editor','thumbnail') //here you can specify what type of inputs will be accessible in the admin area
      );

    register_post_type( 'casestudy' , $args );
}

/****************************************
 * Add custom taxonomy for Case Study *
 ****************************************/

add_action('init', 'case_study_categories_register');

function case_study_categories_register() {
$labels = array(
    'name'                          => 'Case Study Categories',
    'singular_name'                 => 'Case Study Category',
    'search_items'                  => 'Search Case Study Categories',
    'popular_items'                 => 'Popular Case Studes Categories',
    'all_items'                     => 'All Case Study Categories',
    'parent_item'                   => 'Parent Case Study Category',
    'edit_item'                     => 'Edit Case Study Category',
    'update_item'                   => 'Update Case Study Category',
    'add_new_item'                  => 'Add New Case Study Category',
    'new_item_name'                 => 'New Case Study Category',
    'separate_items_with_commas'    => 'Separate Case Study categories with commas',
    'add_or_remove_items'           => 'Add or remove Case Study categories',
    'choose_from_most_used'         => 'Choose from most used Case Study categories'
    );

$args = array(
    'label'                         => 'Case Study Categories',
    'labels'                        => $labels,
    'public'                        => true,
    'hierarchical'                  => true,
    'show_ui'                       => true,
    'args'                          => array( 'orderby' => 'term_order' ),
    'rewrite'                       => array( 'slug' => 'case-studies/categories', 'with_front' => false ),
    'query_var'                     => true
);

register_taxonomy( 'case_study_categories', 'casestudy', $args );
}

Thank you in advance for your help!