Windows 10 users can now use Edge to perform password-less logins to their Microsoft account using a FIDO2 compatible security key. In April Microsoft announced their support for the WebAuthn standard that would bring passwords-less online authentication to Microsoft Edge. Microsoft plans on offering this feature to enterprise and education customers by integrating it into the Azure Active Directory in the future. In order to use this new feature, users will need to be running Windows 10 Build 1809, otherwise known as the October 2018 Update.
Source: https://www.bleepingcomputer.com/news/microsoft/edge-browser-can-now-sign-into-microsoft-accounts-with-fido2-security-keys/