Added a note.

Author: MaryMichael-MS

articles/migrate/prepare-for-agentless-migration.md

@@ -5,7 +5,7 @@ author: vijain
 ms.author: vijain
 ms.topic: conceptual
 ms.service: azure-migrate
-ms.date: 09/01/2023
+ms.date: 04/11/2024
 ms.custom: engagement-fy23, linux-related-content
 ---
 
@@ -52,6 +52,9 @@ After the virtual machine is created, Azure Migrate will invoke the [Custom Scri
 
  ![Migration steps](./media/concepts-vmware-agentless-migration/migration-steps.png)
 
+>[!NOTE]
+>Hydration VM disks do not support Customer Managed Key (CMK). Platform Managed Key (PMK) is the default option.
+
 ## Changes performed during the hydration process
 
 The preparation script executes the following changes based on the OS type of the source VM to be migrated. You can also use this section as a guide to manually prepare the VMs for migration for operating systems versions not supported for hydration.