Custom Switch Page

Hello,
First of all, thank you for the plugin. I would like to say that it is very practical and useful.

I create a link as follows to use this plugin on a special page where users are listed on the WordPress admin page. However, after clicking on the link, I receive the following warning: “The link you followed has expired. Please try again.”
So the link is not working. Can you guide me? I wonder where the error is?
The code is below:

$user_id = get_post_field('post_author', $post_id);
$switch_url = wp_nonce_url( add_query_arg( array(
'action' => 'switch_to_user',
'user_id' => $user_id ,
'nr' => 1,
), wp_login_url() ), "switch_to_user_{ $user_id }" );