I have a premium Azure Managed Disk (SSD) in the same region as a Windows VM, but when I go to attach it via the Azure portal (settings -> Disks -> + Add data disk) the drop down under name says "No managed disk available" (see below). What do I need to do?
To use Premium storage, you'll need a Premium Storage enabled VM size like the DS-series or GS-series virtual machine. You cannot use premium storage disks with VM series that are not Premium Storage-compatible. For details, see Premium Storage: High-Performance Storage for Azure Virtual Machine Workloads.