Add Hub known issue

Author: sethmanheim

azure-stack/operator/known-issues.md

@@ -3,7 +3,7 @@ title: Azure Stack Hub known issues
 description: Learn about known issues in Azure Stack Hub releases.
 author: sethmanheim
 ms.topic: article
-ms.date: 10/31/2024
+ms.date: 11/07/2024
 ms.author: sethm
 ms.reviewer: rtiberiu
 ms.lastreviewed: 11/30/2023
@@ -52,6 +52,13 @@ To access known issues for a different version, use the version selector dropdow
 - Remediation: Microsoft is aware of the problem and is working on a fix.
 - Occurrence: Common.
 
+### A-series VMs deprecated
+
+- Applicable: This issue applies to release 2408.
+- Cause: The A-series VMs are deprecated in Azure, so they cannot be used in Azure Stack Hub.
+- Remediation: Although Azure Stack Hub isn't removing the A-series SKU, other undefined behavior might occur if you continue using it (such as with the load balancer, VMSS, etc). Therefore, you should use a different VM SKU when you are ready. There is no cost difference in using different VM SKUs on Azure Stack Hub.
+- Occurrence: Common.
+
 <!-- ## Alerts -->
 
 <!-- ## Portal -->