https://www.bleepingcomputer.com/news/microsoft/windows-10-20h1-build-18936-released-with-passwordless-sign-in/

Microsoft is rolling out Windows 10 20H1 Build 18936 to Windows Insiders in the Fast ring, with the build including support for passwordless authentication, Phone screen support for more Surface devices, as well as various fixes.

If you are a Windows Insider in the Fast ring, you can update to Insider Preview Build 18936 by going into Settings -> Update & Security -> Windows Update and then checking for new updates.