CSS doc asks - Task #27315831 - VM type supportability

Author: AbhishekMallick-MS

articles/backup/backup-support-matrix-iaas.md

@@ -181,6 +181,7 @@ Configure standalone Azure VMs in Windows Storage Spaces | Not supported.
 Restore with managed identities | Supported for managed Azure VMs. <br><br> Not supported for classic and unmanaged Azure VMs. <br><br> Cross-region restore isn't supported with managed identities. <br><br> Currently, this is available in all Azure public and national cloud regions. <br><br> [Learn more](backup-azure-arm-restore-vms.md#restore-vms-with-managed-identities).
 <a name="tvm-backup">Back up trusted launch VMs</a>    |  Backup is supported. <br><br> Backup of trusted launch VMs is supported through [Enhanced policy](backup-azure-vms-enhanced-policy.md). You can enable backup through a [Recovery Services vault](./backup-azure-arm-vms-prepare.md), the [pane for managing a VM](./backup-during-vm-creation.md#start-a-backup-after-creating-the-vm), and the [pane for creating a VM](backup-during-vm-creation.md#create-a-vm-with-backup-configured).    <br><br>   **Feature details**   <br><br> - Backup is supported in all regions where trusted launch VMs are available. <br><br> - Configuration of backups, alerts, and monitoring for trusted launch VMs is supported through the backup center. <br><br> - Migration of an existing [Gen2 VM](../virtual-machines/generation-2.md) (protected with Azure Backup) to a trusted launch VM is currently not supported. [Learn how to create a trusted launch VM](../virtual-machines/trusted-launch-portal.md?tabs=portal#deploy-a-trusted-launch-vm).  <br><br> - Item-level restore is supported for the scenarios mentioned [here](backup-support-matrix-iaas.md#support-for-file-level-restore).      <br><br>     Note that if the trusted launch VM was created by converting a Standard VM, ensure that you remove all the recovery points created using Standard policy before enabling the backup operation for the VM. 
 [Back up confidential VMs](../confidential-computing/confidential-vm-overview.md) | Unsupported. <br><br>    Note that the following limited preview support scenarios are discontinued and currently not available: <br><br> - Backup of Confidential VMs with no confidential disk encryption.   <br> - Backup of Confidential VMs with confidential OS disk encryption through a platform-managed key (PMK).
+Backup of VMs with SSE and CMK encryption using HSM | Supported. <br><br> You must assign the permissions get, wrap, and uwrap key to the Key Vault to User-assgined managed identity.
 
 ## VM storage support