I know this question have been asked a lot of times but I test all the answers found and it does not work.

I have not the “featured image” block in my wordpress admin. When I create a post for example I have not this and neither in the custom post “team”.

So I have created my own theme, I have no plugin yet (no conflict here).

I have this in functions.php :

add_action( 'after_setup_theme', 'mytheme_add_theme_support' );
function mytheme_add_theme_support() {
add_theme_support('custom-header'); //custom header image
 add_theme_support( 'post-thumbnails' ); //feature image
} //end function add theme support

And in my custom post type “team” I have this :

'supports' => ['title', 'thumbnail', 'editor'], 

My cpt “team” :

add_action('init', 'teams_cpt_init');
function teams_cpt_init() {
    register_post_type('team', [
        'labels' => [
            'name'                  => _x( 'Teams', 'Post type general name', 'mytheme' ),
            'singular_name'         => _x( 'Team', 'Post type singular name', 'mytheme' ),
            'menu_name'             => _x( 'Teams', 'Admin Menu text', 'mytheme' ),
            'name_admin_bar'        => _x( 'Team', 'Add New on Toolbar', 'mytheme' ),
            'add_new'               => __( 'Add new team', 'mytheme' ),
  'featured_image'        => _x( 'Add team picture', 'Overrides the “Featured Image” phrase for this post type. Added in 4.3', 'mytheme' ),
            'set_featured_image'    => _x( 'Add team picture', 'Overrides the “Set featured image” phrase for this post type. Added in 4.3', 'mytheme' ),
            'remove_featured_image' => _x( 'Remove team picture', 'Overrides the “Remove featured image” phrase for this post type. Added in 4.3', 'mytheme' ),
            'use_featured_image'    => _x( 'Use like feature image', 'Overrides the “Use as featured image” phrase for this post type. Added in 4.3', 'mytheme' ),
          

...

],
        'public' => true,
        'has_archive' => true, 
        'rewrite' => ['slug' => 'team'],
        'supports' => ['title', 'thumbnail', 'editor'],  
        'menu_icon' => 'dashicons-flag',
        'show_in_rest' => true,
    ]);
}

And in my functions.php :

require_once __DIR__ .  '/cpt/teams.php';

So I don’t understand why I have not the feature image section in my admin part.

Thanks a lot for your response