Merge pull request #16230 from ronmiab/rb-aum-mindy

Added new section for unsupported interfaces per PM request

Author: prmerger-automator[bot]

azure-stack/hci/update/about-updates-23h2.md

@@ -97,6 +97,18 @@ The PowerShell procedures apply to a single server and multi-server cluster that
 
 You can install available Azure Stack HCI cluster updates via the Azure portal using the Azure Update Manager. For more information, see [Use Azure Update Manager to update your Azure Stack HCI, version 23H2](./azure-update-manager-23h2.md)
 
+### Unsupported interfaces for updates
+
+When you install updates for Azure Stack HCI, version 23H2 don't use the following interfaces:
+
+- SConfig
+- Windows Admin Center
+- Azure Update Manager from the Machines pane in the Azure portal
+- Updates pane from the server (Machine-Azure Arc) resource page in the Azure portal
+- Manual runs of Cluster-Aware Updating
+
+Using these interfaces can install out-of-band updates, which aren't supported within the lifecycle and may cause various issues on the cluster. Additionally, billing for update operations like periodic assessment, checking for updates, using the scheduler, and installing updates on the server resource (Machine-Azure Arc) may occur.
+
 ## Next steps
 
 Learn to [Understand update phases](./update-phases-23h2.md).