Quote:Microsoft introduced password-less sign-in functionality in the Microsoft Edge browser in the October 2018 Update for Windows 10.

The new security feature unlocks options to sign in to Microsoft services without having to enter a password; the functionality is restricted to Microsoft Edge currently and to services by Microsoft such as OneDrive, the Microsoft Store, Outlook, or Skype.

Microsoft Edge supports two main password-less authentication methods: Windows Hello or FIDO2-based.

Windows Hello is not a new service; Windows 10 users may use it to sign in to their accounts on devices running Windows 10. Support is extended to Microsoft Edge in Windows 10 version 1809 to enable password-less sign-ins using Windows Hello.

Microsoft added support for FIDO2-based security keys in the new feature update as well. Windows users may use a security key, e.g. from Yubico or Feitian Technology, to sign-in to Microsoft Accounts in Microsoft Edge. The list of features that security keys need to support is listed on the Microsoft Docs website.

FIDO2-based security keys may be plugged into USB ports of Windows 10 devices.

Full reading: https://www.ghacks.net/2018/11/21/how-to-set-up-a-security-key-for-your-microsoft-account/