The documentation portal is undergoing maintenance. During this period, you can't create any new user credentials. If you do, you'll need to recreate the user credential after the maintenance period ends.
Process of verifying the identity of a user to ensure that they are who they claim to be. In Informatica MDM Hub, users are authenticated based on their supplied credentials—user name / password, security payload, or a combination of both. Informatica MDM Hub provides an internal authentication mechanism and also supports user authentication using third-party authentication providers.