diff --git a/modules/custom/wxt_core/config/install/wxt_core_countries.settings.yml b/modules/custom/wxt_core/config/install/wxt_core.settings.countries.yml
similarity index 100%
rename from modules/custom/wxt_core/config/install/wxt_core_countries.settings.yml
rename to modules/custom/wxt_core/config/install/wxt_core.settings.countries.yml
diff --git a/modules/custom/wxt_core/src/CountriesManager.php b/modules/custom/wxt_core/src/CountriesManager.php
index ac605a34..7059b503 100644
--- a/modules/custom/wxt_core/src/CountriesManager.php
+++ b/modules/custom/wxt_core/src/CountriesManager.php
@@ -94,7 +94,7 @@ public function listCounties() {
    */
   public function whitelistedOptions() {
     $standartCountries = $this->listCounties();
-    $config = $this->configFactory->get('wxt_core_countries.settings');
+    $config = $this->configFactory->get('wxt_core.settings.countries');
     $countries = $config->get('countries');
     foreach ($countries as $abbr => $checkbox) {
       if ($checkbox != 0) {
@@ -108,7 +108,7 @@ public function whitelistedOptions() {
    * Returns the sorted whitelisted.
    */
   public function whitelistedOptionsSorted() {
-    $config = $this->configFactory->get('wxt_core_countries.settings');
+    $config = $this->configFactory->get('wxt_core.settings.countries');
     $whitelist = $this->whitelistedOptions();
     switch ($config->get('whitelist-sort')) {
       case 'alpha':
diff --git a/modules/custom/wxt_core/src/Form/CountriesWhitelistForm.php b/modules/custom/wxt_core/src/Form/CountriesWhitelistForm.php
index 18e5d4fa..9c565d2e 100644
--- a/modules/custom/wxt_core/src/Form/CountriesWhitelistForm.php
+++ b/modules/custom/wxt_core/src/Form/CountriesWhitelistForm.php
@@ -16,7 +16,7 @@ class CountriesWhitelistForm extends ConfigFormBase {
    * {@inheritdoc}
    */
   protected function getEditableConfigNames() {
-    return ['wxt_core_countries.settings'];
+    return ['wxt_core.settings.countries'];
   }
 
   /**
@@ -31,7 +31,7 @@ public function getFormId() {
    */
   public function buildForm(array $form, FormStateInterface $form_state) {
     $countryManager = \Drupal::service('wxt.country_whitelist');
-    $config = $this->config('wxt_core_countries.settings');
+    $config = $this->config('wxt_core.settings.countries');
     $savedCountries = $config->get('countries');
     $whitelisted = $countryManager->getCountryData();
     $options = $countryManager->listCounties();
@@ -96,7 +96,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
    * {@inheritdoc}
    */
   public function submitForm(array &$form, FormStateInterface $form_state) {
-    $this->config('wxt_core_countries.settings')
+    $this->config('wxt_core.settings.countries')
       ->set('countries', $form_state->getValue('countries'))
       ->set('whitelist-sort', $form_state->getValue('whitelist-sort'))
       ->save();
diff --git a/modules/custom/wxt_core/wxt_core.install b/modules/custom/wxt_core/wxt_core.install
index 8c919c32..88ccb9b3 100644
--- a/modules/custom/wxt_core/wxt_core.install
+++ b/modules/custom/wxt_core/wxt_core.install
@@ -675,17 +675,31 @@ function wxt_core_update_8500() {
  * Setup CountryManager lists [#3111375].
  */
 function wxt_core_update_8501() {
-  $config_namespace = 'wxt_core_countries.settings';
-  $module_handler = \Drupal::service('module_handler');
-  $module_path = $module_handler->getModule('wxt_core')->getPath();
-  $path = DRUPAL_ROOT . '/' . $module_path . '/config/install/' . $config_namespace . '.yml';
-  $country_data = Yaml::parse(\file_get_contents($path));
+  //   [#3399929] wxt_core_update_8502 in favour
+}
 
-  // Get the configuration factory service.
+/**
+ *  [#3399929] Change wxt_core countries config namespace.
+ */
+function wxt_core_update_8502() {
+  $legacy = 'wxt_core_countries.settings';
+  $updated = 'wxt_core.settings.countries';
   $config_factory = \Drupal::configFactory();
-
-  // Save the configuration using the loaded data.
-  $config = $config_factory->getEditable($config_namespace);
-  $config->setData($country_data);
-  $config->save();
+  $module_handler = \Drupal::service('module_handler');
+  $module_path = $module_handler->getModule('wxt_core')->getPath();
+  $path = DRUPAL_ROOT . '/' . $module_path . '/config/install/' . $updated . '.yml';
+  $hasUpdated = $config_factory->get($legacy)->isNew();
+  if ($hasUpdated) {
+    $country_data = $config_factory->getEditable($legacy);
+    $config = $config_factory->getEditable($updated);
+    $config->setData($country_data);
+    $config->save();
+    // Delete old data.
+    $country_data->delete();
+  } else {
+    $country_data = Yaml::parse(\file_get_contents($path));
+    $config = $config_factory->getEditable($updated);
+    $config->setData($country_data);
+    $config->save();
+  }
 }
diff --git a/modules/custom/wxt_ext/wxt_ext_webform/wxt_ext_webform.module b/modules/custom/wxt_ext/wxt_ext_webform/wxt_ext_webform.module
index 21d9f50c..2ac0202c 100644
--- a/modules/custom/wxt_ext/wxt_ext_webform/wxt_ext_webform.module
+++ b/modules/custom/wxt_ext/wxt_ext_webform/wxt_ext_webform.module
@@ -125,7 +125,7 @@ function _gcweb_did_you_find_form_ajax_submit($form, $form_state) {
  * Implements hook_webform_options_WEBFORM_OPTIONS_ID_alter() for country names options.
  */
 function wxt_ext_webform_webform_options_country_names_alter(array &$options, array $element = []) {
-  $config = \Drupal::configFactory()->get('wxt_core_countries.settings');
+  $config = \Drupal::configFactory()->get('wxt_core.settings.countries');
   if ($config->get('webform-override') == 1) {
     $countryManager = \Drupal::service('wxt.country_whitelist');
     $options = $countryManager->whitelistedOptionsSorted();
@@ -145,7 +145,7 @@ function wxt_ext_webform_form_wxt_core_countries_settings_form_alter(&$form, For
   $form['webform-box']['webform-override'] = [
     '#type' => 'checkbox',
     '#title' => t('Override Webform Options for Country Names'),
-    '#default_value' => \Drupal::config('wxt_core_countries.settings')->get('webform-override'),
+    '#default_value' => \Drupal::config('wxt_core.settings.countries')->get('webform-override'),
     '#description' => t('@link can be edited or reset in many circumstances.', ['@link' => $link->toString()]),
   ];
   $form['#submit'][] = 'wxt_ext_webform_form_wxt_core_countries_submit';
@@ -156,7 +156,7 @@ function wxt_ext_webform_form_wxt_core_countries_settings_form_alter(&$form, For
  */
 function wxt_ext_webform_form_wxt_core_countries_submit(&$form, FormStateInterface $form_state) {
   \Drupal::configFactory()
-    ->getEditable('wxt_core_countries.settings')
+    ->getEditable('wxt_core.settings.countries')
     ->set('webform-override', $form_state->getValue('webform-override'))
     ->save();
 }