Due to network isolation in Windows 10 (is it a bug ?). Edge can’t access domain in VirtualBox network, so we use regedit.exe
Looks for key registry name as
*NdisDeviceType of your virtual network card (from VirtualBox), and change the value to “0” (value is set to one by default), and reboot.
To find the key, see something like that in the registry
The change will make your network card in active networks, as a “Public” or “Unidentified” network.