Last updated: Dec 10, 2024
Overview
This article explains whether a unique email address is needed under the following circumstances:
- When using email + password authentication with database connections
- When using username + password authentication
Applies To
- Email Address
- Database Connections
- Password Authentication
Solution
Auth0 enforces the uniqueness of the email or username within a connection.
For example, two users cannot have the same email address in the same connection, such as a regular DB email/password connection, but two users can have the same email address if they belong to different connections, such as a social connection and a regular DB email/password connection. Account linking can be used to ensure uniqueness across connections in this scenario.
NOTE: If a database connection does not have Email Address set as one if the Identifier attributes, email uniqueness will still be enforced for that connection.
