Make It Easy for Your Community Users to Log In with Identity Verification Methods Instead of Passwords
Where: This feature is available for Lightning communities and Salesforce Tabs + Visualforce communities, accessed through Lightning Experience and Salesforce Classic. Communities are available in Enterprise, Performance, Unlimited, and Developer editions.
Who: This feature is available only for users with an External identity or community license. Contact Salesforce Customer Support to use the SMS verification method (beta).