ACP2E-4072: VAT Validation fails because of VAT API rate limiter - triggers false positive customer group change

Author: o-dubovyk

app/code/Magento/Customer/Model/Vat.php

@@ -1,7 +1,7 @@
 <?php
 /**
- * Copyright © Magento, Inc. All rights reserved.
- * See COPYING.txt for license details.
+ * Copyright 2014 Adobe
+ * All Rights Reserved.
  */
 namespace Magento\Customer\Model;
 
@@ -144,6 +144,14 @@ public function getCustomerGroupIdBasedOnVatNumber($customerCountryCode, $vatVal
                 ScopeInterface::SCOPE_STORE,
                 $store
             );
+
+            if (!$groupId) {
+                $groupId = (int)$this->scopeConfig->getValue(
+                    GroupManagement::XML_PATH_DEFAULT_ID,
+                    ScopeInterface::SCOPE_STORE,
+                    $store
+                );
+            }
         }
 
         return $groupId;

app/code/Magento/Customer/Observer/AfterAddressSaveObserver.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Copyright 2025 Adobe
+ * Copyright 2011 Adobe
  * All Rights Reserved.
  */
 declare(strict_types=1);

app/code/Magento/Quote/Observer/Frontend/Quote/Address/VatValidator.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Copyright 2025 Adobe
+ * Copyright 2013 Adobe
  * All Rights Reserved.
  */
 namespace Magento\Quote\Observer\Frontend\Quote\Address;