Allowed Countries does not work correctly

app/code/Magento/Customer/Model/Address/Validator/Country.php

@@ -15,6 +15,7 @@
 use Magento\Framework\Validator\ValidateException;
 use Magento\Framework\Validator\ValidatorChain;
 use Magento\Store\Model\ScopeInterface;
+use Magento\Store\Model\StoreManagerInterface;
 
 /**
  * Address country and region validator.
@@ -36,18 +37,26 @@ class Country implements ValidatorInterface
      */
     private $allowedCountriesReader;
 
+    /**
+     * @var StoreManagerInterface
+     */
+    private $storeManager;
+
     /**
      * @param Data $directoryData
      * @param AllowedCountries $allowedCountriesReader
+     * @param StoreManagerInterface $storeManager
      * @param Escaper|null $escaper
      */
     public function __construct(
         Data $directoryData,
         AllowedCountries $allowedCountriesReader,
+        StoreManagerInterface $storeManager,
         Escaper $escaper = null
     ) {
         $this->directoryData = $directoryData;
         $this->allowedCountriesReader = $allowedCountriesReader;
+        $this->storeManager = $storeManager;
         $this->escaper = $escaper ?? ObjectManager::getInstance()->get(
             Escaper::class
         );
@@ -134,7 +143,13 @@ private function validateRegion(AbstractAddress $address)
      */
     private function getWebsiteAllowedCountries(AbstractAddress $address): array
     {
-        $storeId = $address->getData('store_id');
-        return $this->allowedCountriesReader->getAllowedCountries(ScopeInterface::SCOPE_STORE, $storeId);
+        $scopeCode = $address->getData('store_id');
+        $scope = ScopeInterface::SCOPE_STORE;
+        if (!$scopeCode && $address->getCustomer() && $address->getCustomer()->getSharingConfig()?->isGlobalScope()) {
+            $scopeCode = array_keys($this->storeManager->getWebsites(false, true));
+            $scope = ScopeInterface::SCOPE_WEBSITES;
+        }
+
+        return $this->allowedCountriesReader->getAllowedCountries($scope, $scopeCode);
     }
 }

app/code/Magento/Customer/Model/ResourceModel/Address/Attribute/Source/CountryWithWebsites.php

@@ -117,17 +117,10 @@ public function getAllOptions($withEmpty = true, $defaultValues = false)
 
                 $allowedCountries = array_unique(array_merge([], ...$allowedCountries));
             } else {
-                // Address can be added only for the allowed country list.
-                $websiteId = null;
-                $customerId = $this->request->getParam('parent_id') ?? null;
-                if ($customerId) {
-                    $customer = $this->customerRepository->getById($customerId);
-                    $websiteId = $customer->getWebsiteId();
-                }
-
+                $websiteCodes = array_keys($this->storeManager->getWebsites(false, true));
                 $allowedCountries = $this->allowedCountriesReader->getAllowedCountries(
-                    ScopeInterface::SCOPE_WEBSITE,
-                    $websiteId
+                    ScopeInterface::SCOPE_WEBSITES,
+                    $websiteCodes
                 );
             }