wp_logout_url redirect not working

Use this logout link <li class="signOut"><a href="<?php echo wp_logout_url(); ?>" title="Logout">Logout</a></li>

And add below code in your functions.php file to redirect the user to the page you want:

add_action( 'wp_logout', 'auto_redirect_user_after_logout');
function auto_redirect_user_after_logout(){
  wp_redirect( 'https://example.com/haendler-login/' );
  exit();
}