Users can be logged in to modern workspaces using different cloud identity providers and single sign-on. A login manager can be provided on a user computing device to obtain a user's login credentials via a custom login screen. The login manager can then inject the login credentials into an authentication interface of a cloud identity provider to authenticate the user for purposes of logging in to the user computing device. The login manager can leverage this authentication to perform single sign-on for all resources of a modern workspace such that the user can be logged in to the modern workspace via any cloud identity provider.