Wordpress REST API The POST Method doesn't work

I used following script for REST API for POST Method in my existing method. this message is showing ""No route was found matching the URL and request method."," where is the error. I have already "save change" in the Permalink. various way verify my code which is corrected. same error is showing

class Class_dashboard { 

    public function __construct() {
       $this->display_latest_post();
       add_action('rest_api_init', array($this, 'lincense_register_routes'));   
    }  

    public function lincense_register_routes() {
        register_rest_route('license/v2', '/verify/', array(
            'methods' => 'POST',
            'callback' => array($this, 'verify_license_key'),
            'permission_callback' => '__return_true',
        ));
    }

    public function verify_license_key(WP_REST_Request $request) {
        header("Access-Control-Allow-Origin: *");  // Allow requests from any origin
        header("Access-Control-Allow-Methods: POST, GET");
        header("Access-Control-Allow-Headers: Content-Type");

        $license_key = sanitize_text_field($request->get_param('license_key'));
        //$license_key === '06078F5C173B8B98BFA8';
        global $wpdb;
        $table_name = $wpdb->prefix . 'woo_license_item';
    
        $result = $wpdb->get_row(
            $wpdb->prepare("SELECT * FROM $table_name WHERE licenseKey = %s", $license_key)
        );

        if ($result) {
            // Check if the license is active and not expired
            //if ($result->keystatus === 'close' && (empty($result->expiration_date) || strtotime($result->expiration_date) > time())) {
            if ($result->keystatus === 'close') {
                return new WP_REST_Response(array('status' => 'valid', 'message' => 'License is valid'), 200);
            } else {
                return new WP_REST_Response(array('status' => 'expired', 'message' => 'License has expired'), 200);
            }
        } else {
            return new WP_REST_Response(array('status' => 'invalid', 'message' => 'License key not found'), 200);
        }
    }
}

I cant find the error. why showing error again and again