Hi Hnin,
If you're having trouble deleting an Azure Resource Group with a vault in "Locked Immutable Recovery Services" state, follow these steps:
Check Dependencies: Make sure there are no linked resources like virtual machines preventing deletion.
Unlock Recovery Services Vault: Disable any retention policies or immutability settings in the vault.
Review Azure Policies: Check for policies restricting resource deletion and adjust or remove them.
Remove Locks: Remove any locks applied to the vault or resource group using the Azure Portal or PowerShell.
Use PowerShell: Try using Remove-AzResourceGroup -Name YourResourceGroupName -Force
in PowerShell.
Contact Azure Support: If all else fails, reach out to Azure Support for assistance.
Always be cautious and ensure backups before deleting resources. If the answer helped, or pointed you in the right direction, please click accept answer or please share more information to help you better.