Adrian Lorenc
--- a/src/Form/BanUserForm.php
+++ b/src/Form/BanUserForm.php
  /**
   * {@inheritdoc}
   */
-  public function buildForm(array $form, FormStateInterface $form_state, $target_id = NULL): array {
--- a/src/Form/BanUserForm.php
+++ b/src/Form/BanUserForm.php
-      '#title' => $this->t('Blocked User'),
-      '#default_value' => $target_id,
-      '#required' => FALSE,
+      '#title' => $this->t('Select User'),
+      '#required' => TRUE,
+      '#type' => 'entity_autocomplete',
+      '#target_type' => 'user',
+      '#tags' => FALSE,
+      '#selection_handler' => 'private_message:not_blocked_user',
+      '#selection_settings' => [
+        'include_anonymous' => FALSE,
+      ],
    ];

-    $submitLabel = $config->get('ban_label');
-    if ($target_id && $this->privateMessageBanManager->isBanned($target_id)) {
--- a/src/Controller/AjaxController.php
+++ b/src/Controller/AjaxController.php
    return $response;
  }

-  /**
-   * Handler for autocomplete request for banning people.
-   */
-  public function privateMessageBanMembersAutocomplete(Request $request) {
-    $results = [];
-
-    if ($input = $request->query->get('q')) {
-      $typed_string = Tags::explode($input);
-      $typed_string = mb_strtolower(array_pop($typed_string));
-      $accounts = $this->privateMessageService->getUsersFromString($typed_string, self::AUTOCOMPLETE_COUNT);
-
-      foreach ($accounts as $account) {
-        if (!$this->privateMessageBanManager->isBanned($account->id())) {