I would like to use the passwordless auth feature. The one caveat is that I need to control the email addresses and phone numbers that can be allowed to be authenticated: A whitelist if you will. Does Auth0 have that feature?
If so, can you point me any documentation that would explain how to make that whitelist?
Based on the information provided my recommendation would be for you to disable sign ups for the connections in queston (you can do so in the connection settings through the dashboard) and then create individual users that are authorized/white-listed through the Management API. If you already have a considerable amount of users you can consider using the import users endpoint and then for future ones if the frequency and number of users being added/authorized is not a lot then you can use the create a user endpoint.