Until Microsoft gets more fixes in, I'd stick to old virtual machines like VirtualBox or similar.
https://www.onmsft.com/news/microsoft-confirms-that-windows-sandbox-fails-to-launch-on-windows-10-insider-build-18305-1003 for example. I do not expect such to be a feature we can use today.
My Windows Sandbox it's not working. I have all things enable - Virtualization, Hypervisor and Sandbox on Panel Control, but when the Sandbox start (only a blue window with the sandbox logo) just stays there for a long time before crash. Crash error: Error 0x800706d9. There are no more endpoints available from the endpoint mapper.
Thank you in advance.