Now users could login by their handset by avoid the password from Authenticator app of Microsoft. According to Microsoft, this process is easier and defensive than two steps verification.
Microsoft had mentioned in a blog post that from phone sign in feature users could bypass the step of entering password. This feature is like Google prompt. To use this feature users have to install App on their iOS or Android device.
After this, whenever users will mention their viewers name in log in field, they will get a prompt on their handsets. By approving this users could log in to their accounts without entering password.