Update export-to-data-lake.md

Added a note for Azure Data Lake firewall settings

Author: sabinn-msft

powerapps-docs/maker/common-data-service/export-to-data-lake.md

@@ -87,6 +87,9 @@ Your Common Data Service environment is linked to the Azure Data Lake Storage Ge
 > [!NOTE]
 > The data exported by Export to data lake service is encrypted at rest in Azure Data Lake Storage Gen2. Additionally, transient data in the blob storage is also encrypted at rest. Encryption in Azure Data Lake Storage Gen2 helps you protect your data, implement enterprise security policies, and meet regulatory compliance requirements. More information: [Azure Data Encryption-at-Rest]( /azure/security/fundamentals/encryption-atrest)
 
+> Currently, we do not support providing public IPs for Export to data lake service that can be used in **Azure Data Lake firewall settings**. Public IP network rules have no effect on requests originating from the same Azure region as the storage account. Services deployed in the same region as the storage account use private Azure IP addresses for communication. Thus, you cannot restrict access to specific Azure services based on their public outbound IP address range. 
+More information: [Configure Azure Storage firewalls and virtual networks]( /azure/storage/common/storage-network-security)
+
 ## Manage entity data to the data lake
 
 After you've set up data export to Azure Data Lake Storage Gen2 in your subscription, you can manage the export of entity data to the data lake in one of two ways: