Using Webform Submission, update a custom field attached to a user

EDIT: After working more on this, the user cannot be blocked and must be active / authenticated.

Using webforms, I have a form that has a field that a new user (blocked) needs to fill out to tell the admin what area they belong to. Is there a way that I can add the field value to the user (blocked, but currently filling out the form) account?

I have tried:

function helper_form_alter(&$form, FormStateInterface $form_state, $form_id)
{
  if (in_array($form_id, ['webform_submission_request_account_node_123_add_form'])) {
    $form['actions']['submit']['#submit'][] = '_helper_additional_insert';
  }
}
function _helper_additional_insert($form, &$form_state)
{
  ksm($form);
}

However, I can never see the ksm output, even having the form show modal or message for example. I tried outputting the value to the log also with no love.

I thought of using RULES, but I do not see how I can capture the field value and then update the current user field with it...

Suggestions? Thoughts? Thanks!

Here is a working solution as long as the user is "active" and authenticated without any permissions that works for my usecase:

/**
 * Implements hook_form_alter().
 * This function is called whenever a form is altered.
 * Here, we are targeting the webform_submission_request_account_node_100_add_form form.
 */
function submission_helper_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if (in_array($form_id, ['webform_submission_request_account_node_100_add_form'])) {
    // Add a custom submit handler to the form.
    // When the form is submitted, submission_helper_set_user_field() will be called.
    $form['actions']['submit']['#submit'][] = 'submission_helper_set_user_field';
  }
}

/**
 * Custom submission handler to set user field.
 * This function is called when the webform_submission_request_account_node_100_add_form is submitted.
 */
function submission_helper_set_user_field(&$form, &$form_state) {
  // Load the current user object.
  $user = \Drupal\user\Entity\User::load(\Drupal::currentUser()->id());
  
  // Get the value of the field_name field from the form.
  $selected_field_tid = $form_state->getValue('field_name');

  // Set the value of the field_user_field_machine_name field on the user object.
  $user->set('field_user_field_machine_name', $selected_field_tid);

  // Save the user object to the database.
  $user->save();

  // Load the taxonomy term object for the selected field.
  $term = \Drupal::entityTypeManager()->getStorage('taxonomy_term')->load($selected_field_tid);
  
  // If the taxonomy term object exists, log the term name to the Drupal logger.
  if ($term) {
    $term_name = $term->getName();
    \Drupal::logger('submission_helper')->notice('User account requested and user field set to: @field.', ['@field' => $term_name]);
  }
}