Fix has been updated

Author: engcom-Hotel

app/code/Magento/Customer/Block/Form/Register.php

@@ -9,6 +9,7 @@
 use Magento\Customer\Model\AccountManagement;
 use Magento\Framework\App\ObjectManager;
 use Magento\Newsletter\Model\Config;
+use Magento\Store\Model\ScopeInterface;
 
 /**
  * Customer register form block
@@ -184,7 +185,7 @@ public function getRegion()
     public function isNewsletterEnabled()
     {
         return $this->_moduleManager->isOutputEnabled('Magento_Newsletter')
-            && $this->newsLetterConfig->isActive();
+            && $this->newsLetterConfig->isActive(ScopeInterface::SCOPE_STORE);
     }
 
     /**

app/code/Magento/Newsletter/Model/Config.php

@@ -41,7 +41,7 @@ public function __construct(
      * @param string $scopeType
      * @return bool
      */
-    public function isActive(string $scopeType = \Magento\Store\Model\ScopeInterface::SCOPE_STORE): bool
+    public function isActive(string $scopeType = ScopeConfigInterface::SCOPE_TYPE_DEFAULT): bool
     {
         return $this->scopeConfig->isSetFlag(self::XML_PATH_NEWSLETTER_ACTIVE, $scopeType);
     }