Linked logins
From MoodleDocs
New feature
in Moodle 4.2!
In User menu > Preferences > Linked logins, a user can link their account on an external site, such as Google G-Suite, Microsoft or Facebook, and then log in to their Moodle site using their account on the external site.
To make use of linked logins, OAuth 2 authentication should be enabled by a site administrator.