Nested virtualization not working (Fedora33, Win10Pro guest)

[kergeodeta]

Hi all!

I have a laptop with an AMD Ryzen 4750U Pro with AMD-V support and it is enabled in BIOS. I running Fedora 33 as HostOS and I would like to run a Win10 guest.
I created a virtual machine, on the Settings -> System -> Processor page the "Enable Nested VT-x/AMD-V" and "Enable PAE/NX" settings are enabled and installed Win10 Pro successfully. Then updated the Win10 Pro, set and install WSL2 based on officially microsoft documentation and Docker Engine says "virtualization not supported on this host".

Is it a Host or Guest side problem? What should I do to fix this issue? Can someone help me?

[multiOS]

VirtualBox User Manual, Para 9.33:

Oracle VM VirtualBox supports nested virtualization. This feature enables the passthrough of hardware virtualization functions to the guest VM. That means that you can install a hypervisor, such as Oracle VM VirtualBox, Oracle VM Server or KVM, on an Oracle VM VirtualBox guest. You can then create and run VMs within the guest VM.

The software products you have tried are not (currently) supported in VirtualBox Guests. Also WSL2 is dependent on Microsoft's Hyper-V technology, a Type 1 Hypervisor which loads prior to the OS startup.