Many projects need to implement some form of authentication. Most of the time this involves integrating with an identity provider, like login.gov, Okta, AWS Cognito, Azure Active Directory B2C, Auth0, etc. This milestone involves adding a default set up for authentication and perhaps one or more built-in integrations that project teams can choose from. Ideally it is also easy to remove identity providers or the auth system altogether if a project doesn't need it.