ACP2E-877: Customers not filtered by 'Signed up point' when creating an order in Admin

 - Fixed the issue.

Author: devarul

app/code/Magento/Sales/Model/ResourceModel/Order/Customer/Collection.php

@@ -15,6 +15,7 @@
 use Magento\Framework\DataObject\Copy\Config;
 use Magento\Framework\DB\Adapter\AdapterInterface;
 use Magento\Framework\Event\ManagerInterface;
+use Magento\Framework\Exception\LocalizedException;
 use Magento\Framework\Model\ResourceModel\Db\VersionControl\Snapshot;
 use Magento\Framework\Validator\UniversalFactory;
 use Magento\Store\Model\StoreManagerInterface;
@@ -154,4 +155,35 @@ protected function beforeAddLoadedItem(DataObject $item): DataObject
 
         return parent::beforeAddLoadedItem($item);
     }
+
+    /**
+     * @inheritDoc
+     * @throws LocalizedException
+     */
+    public function addFieldToFilter($field, $condition = null)
+    {
+        if ($field === 'store_name') {
+            $this->joinField(
+                'store_name',
+                'store',
+                'name',
+                'store_id=store_id',
+                null,
+                'left'
+            );
+        }
+
+        if ($field === 'website_name') {
+            $this->joinField(
+                'website_name',
+                'store_website',
+                'name',
+                'website_id=website_id',
+                null,
+                'left'
+            );
+        }
+
+        return parent::addFieldToFilter($field, $condition);
+    }
 }