I have a Azure Virtual Machine Scale Sets with 10 instances. Since we are migrating from Intel SKU to AMD SKU, I resize my VMSS's CPU size from Standard_DS2_v2 to Standard_E4-2as_v4. After successfully upgrate, the size of VMSS is shown as Standard_E4-2as_v4. However, the instance still shows Standard_DS2_v2 and from subscription quota I can see the used SKU is still the Standard_DS2_v2. Seems the migration of SKU failed. How to resize VMSS? Thanks!
You could update to the latest, then the instance will be restart and change to target VM size. You can click the Upgrade button from each scale set instance panel. After a while, go back to the Virtual machine scale set panel then review the instance panel again, you will see the updated size.
Or you can use PowerShell commands to manage it. This command starts an upgrade of the VMSS named VMScaleSet001 that has the instance ID of 0.