Make sure you are on the "Enter your Microsoft email" part, so that you have to setup Microsoft.
Go on VirtualBox to "Devices" > "Network" and click "Connect Network Adapter" to disable it.
Then click on the back-arrow (←) to go one step back and then you will be forwarded again to "Enter your name".
Now you can put any name and then continue without Microsoft Login
Go on VirtualBox to "Devices" > "Network" and click "Connect Network Adapter" to disable it.
Then click on the back-arrow (←) to go one step back and then you will be forwarded again to "Enter your name".
Now you can put any name and then continue without Microsoft Login