Added script action section

Added script action section. Ref Apurba, Chinmens and Sushma.

Author: sreekzz

articles/hdinsight/configure-azure-blob-storage.md

@@ -3,7 +3,7 @@ title: Configure Azure Blob Storage on Azure HDInsight
 description: Learn how to Configure Azure Blob storage on Azure HDInsight.
 ms.service: azure-hdinsight
 ms.topic: how-to
-ms.date: 11/15/2023
+ms.date: 11/25/2023
 
 ---
 # Configure Azure Blob Storage as primary storage account in Azure HDInsight
@@ -82,7 +82,22 @@ Same thing can be achieved via ARM request if that is how you want to create HDI
 
     } 
     ```  
-     
+
+## MSI based Script Action using primary Azure Blob Storage storage 
+
+Previously while adding the primary storage as Azure Blob Storage storage in the Azure HDInsight cluster, you can't provide MSI for authentication. 
+Also to access a script action that is not accessible anonymously, you need to mention the SAS Key in the script action parameters, so the Azure HDInsight Cluster can access the script for execution.
+
+Now, you can add Azure Blob Storage storage in Azure HDInsight cluster as a primary storage using MSI. 
+
+Hence there is no need to provide the SAS key in the script action parameters, while adding the script action, if the script uploaded to the  primary Azure Blob Storage storage account. 
+
+The script will be downloaded and implemented. This will work even if the script is not publicly accessible. 
+
+The new feature specifically supports scripts that are not publicly accessible but do not require a SAS key or token. This provides an additional layer of security for scripts that need to be kept private. 
+
+The conventional script action in a storage which is anonymously accessible or if a SAS key is passed along with the script URI, will still work without any changes. For more inforation, see [Customize Azure HDInsight clusters by using script actions](./hdinsight/hdinsight-hadoop-customize-cluster-linux.md)     
+
 ## Next steps
 
 * [Use Azure Data Lake Storage Gen2 with Azure HDInsight clusters](./hdinsight-managed-identities.md)