You can enroll multiple fingers, you can enroll multiple security keys, you can enroll multiple phone numbers, and you can create and share an account PIN. Choo

You can enroll multiple fingers, you can enroll multiple security keys, you can enroll multiple phone numbers, and you can create and share an account PIN. Choose any combination of these authenticators. Microsoft also has very mature permissions for all of their web properties like OneDrive and SharePoint/Teams. So you can also give people their own logins and then share stuff between them.