Perform an LDAP search from a module

I am trying to perform an LDAP search from hook_form_validation() in a webform using Drupal 9 and drupal/ldap 4.3.

I have configured the LDAP module on my site, but I am not using it for authentication. I can however use ldap query and perform a test of the ldap server on /admin/config/people/ldap/server successfully.

At the bottom of API usage they say you can use the following code.

$factory = \Drupal::service('ldap.servers');
$server = $factory->getServerByIdEnabled('my_server');

I have been enlightend cliefen that the service is ldap.bridge. Here is my current code.

use Drupal\user\Entity\User;
use Drupal\taxonomy\Entity\Term;
use Drupal\ldap_servers\Entity\Server;


function drp_form_alter( &$form, &$form_state, $form_id ) {
  if ( $form_id === 'webform_submission__myform_node_5930_add_form' ) {
    $userid = \Drupal::currentUser()->id();
    $username = \Drupal::currentUser()->getAccountName();
    $server = \Drupal::service('entity_type.manager')->getStorage( 'ldap_server')->load('myserver');
    $bridge = \Drupal::service('ldap.bridge');
    $bridge->setServer( $server );
    if ($bridge->bind()) {
        
        // $dn ='ou=accounts,ou=departments,dc=servername,dc=someplace';
        // $filter="(uid=xxxx1)";
        // $returnattr = array( "sn", "givenname", "mail");

    }
  }

}

I was able to successfully bind the ldap server.

Question: how do I actually make an ldap search, using the drupal/ldap code, inside the bridge->bind if statement?

I did not use the $factory-> code that the API mentioned. Do I need to?

Thanks for all your help, I am struggling, but learning :)

I think there's just a couple of calls missing, or at least the following works for me:

if ($bridge->bind()) {
    $ldap = $bridge->get() ;
    $options = [] ;
    $entries = $ldap
        ->query('', "(&(objectclass=groupOfNames)(member=$user_dn))", $options) 
        ->execute() 
        ->toArray() ;
}

(The query is irrelevant, of course – it comes straight from my code).