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I have a problem with my custom taxonomy 'Location' for my custom post type 'Project'. I have created templates for it as :

Even after trying solutions found on this forum, I am still stuck.
Thank you for your help.

I am having problem when I want to display my taxonomy template.
I have created one custom taxonomy 'Location' for my custom post type 'Project'. Moreover, I have created templates for it as :

EDIT:
If I change my taxonomy slug into something else, I get my taxonomy template working.
Example:

 taxonomy slug => "location"  
 mywebsite.com/location/united-kingdom/ => Taxonomy template working !  

But I want my taxonomy to work with my custom post type. To get my taxonomy template when accessing mywebsite.com/{custom-post-type}/{taxonomy}/
But this give me archive-{custom-post-type}.php file instead.

Following the Template Hierarchy I expect Wordpress to find me the taxonomy template before the archive template.

Is there something I am missing ?
Thank you for your help.

I should have messed up or missed something when creating my taxonomy but can't get it right.

My targetted URLs are :
mywebsite.com/holliday/united-kingdom/ (Location taxonomy)
mywebsite.com/holliday/united-kingdom/london (Location taxonomy child)

I should have messed up or missed something when creating my taxonomy but can't get it right.

Here is my code :

$cats_args = array( 
    'labels'            => array(
        'name'              => _x( 'Project Location', 'mon-plugin' ),
        'singular_name'     => _x( 'Location', 'mon-plugin' ),
        'search_items'      => __( 'Search Location', 'mon-plugin' ),
        'all_items'         => __( 'All Location', 'mon-plugin' ),
        'parent_item'       => __( 'Parent Location', 'mon-plugin' ),
        'parent_item_colon' => __( 'Parent Location:', 'mon-plugin' ),
        'edit_item'         => __( 'Edit Location', 'mon-plugin' ),
        'update_item'       => __( 'Update Location', 'mon-plugin' ),
        'add_new_item'      => __( 'Add New Location', 'mon-plugin' ),
        'new_item_name'     => __( 'New Location Name', 'mon-plugin' ),
        'menu_name'         => __( 'Location', 'mon-plugin' ),
    ),
    'hierarchical'      => true,
    'public'            => true,
    'show_ui'           => true,
    'has_archive'       => true,
    'rewrite'           => array(
        'slug'              => 'project',
        'hierarchical'      => true
    )
);
// Register taxonomy
register_taxonomy( 'project_location', 'project', $cats_args );

Here is my code (register post type and register taxonomy) :

// Register Post Type (Holliday)
$capability = 'publish_posts';

$cpt_args = array(
    'menu_icon'         => 'dashicons-groups',
    'labels'            => array(
        'name'              => __( 'Holliday', 'mon-plugin' ),
        'singular_name'     => __( 'Holliday', 'mon-plugin' ),
        'add_new'           => __( 'Add Holliday', 'mon-plugin' ),
        'add_new_item'      => __( 'Add Holliday', 'mon-plugin' ),
        'edit'              => __( 'Edit', 'mon-plugin' ),
        'edit_item'         => __( 'Edit Holliday', 'mon-plugin' ),
        'new_item'          => __( 'New Holliday', 'mon-plugin' ),
        'view'              => __( 'View Holliday', 'mon-plugin' ),
        'view_item'         => __( 'View Holliday', 'mon-plugin' ),
        'search_items'      => __( 'Search Holliday', 'mon-plugin' ),
        'not_found'         => __( 'No Holliday found', 'mon-plugin' ),
        'not_found_in_trash'=> __( 'No Holliday found in Trash', 'mon-plugin' ),
        'parent'            => __( 'Parent Holliday', 'mon-plugin' ),
    ),
    'public'            => true,
    'has_archive'       => true,
    'rewrite'           => array(
        'slug'              => 'holliday/%my_project_location%',
    ),
    'supports'          => array('title', 'custom-fields', 'excerpt', 'editor', 'author', 'thumbnail', 'comments'),
    'capabilities'      => array(
        'publish_posts'     => $capability,
        'edit_posts'        => $capability,
        'edit_others_posts' => $capability,
        'delete_posts'      => $capability,
        'delete_others_posts'=> $capability,
        'read_private_posts'=> $capability,
        'edit_post'         => $capability,
        'delete_post'       => $capability,
        'read_post'         => $capability
    ),
);
register_post_type( 'my_project', $cpt_args );

// Register Taxonomy (Location)
$cats_args = array( 
    'labels'            => array(
        'name'              => _x( 'Project Location', 'mon-plugin' ),
        'singular_name'     => _x( 'Location', 'mon-plugin' ),
        'search_items'      => __( 'Search Location', 'mon-plugin' ),
        'all_items'         => __( 'All Location', 'mon-plugin' ),
        'parent_item'       => __( 'Parent Location', 'mon-plugin' ),
        'parent_item_colon' => __( 'Parent Location:', 'mon-plugin' ),
        'edit_item'         => __( 'Edit Location', 'mon-plugin' ),
        'update_item'       => __( 'Update Location', 'mon-plugin' ),
        'add_new_item'      => __( 'Add New Location', 'mon-plugin' ),
        'new_item_name'     => __( 'New Location Name', 'mon-plugin' ),
        'menu_name'         => __( 'Location', 'mon-plugin' ),
    ),
    'hierarchical'      => true,
    'public'            => true,
    'show_ui'           => true,
    'has_archive'       => true,
    'rewrite'           => array(
        'slug'              => 'holliday',
        'hierarchical'      => true
    )
);
register_taxonomy( 'my_project_location', 'my_project', $cats_args );