Through its partner, the GWDG, DARIAH-DE offers and maintains the DARIAH-DE AAI. Since 2006 DARIAH-DE runs a productive Authentication and Authorization Infrastructure (AAI) for the DARIAH-EU community that allows researchers around the world to authenticate with an account either from the home institution or from DARIAH, while benefiting from a Single Sign-On experience and fine-grained authorization mechanisms. To widen the usage of this infrastructure the DARIAH-EU FIM4D Working Group invites and helps all DARIAH members to integrate their services. In the past, it was difficult to connect services to the DARIAH AAI. In mid 2018, DARIAH introduced a central AAI proxy that brokers between DARIAH services and eduGAIN. The proxy took over many tasks from the services, which makes it much easier to connect new services.