Hi
Nested virtualization need a Dv3 and Ev3 VM sizes.
Nested virtualization lets you run virtual machine (VM) instances inside of other VMs so you can create your own virtualization environments. To support nested virtualization, Compute Engine adds Intel VT-x instructions to VMs, so when you create a VM, the hypervisor that is already on that VM can run additional VMs.
Such support in necessary if the tool you use run a VM via the Android Emulator.