During the last years, many companies established fast IT or digital IT units dedicated to build and operate digital customer-facing services. These units adopted agile methods, new tool chains as well as new organizational settings like BizDevOps teams. BizDevOps teams are responsible for continuously (re) defining business functionality of certain (micro-) services, (re) developing and running them. In these new fast IT environments, the role of enterprise architecture management changes dramatically. BizDevOps teams have a high degree of autonomy in designing both, the functionality and the architecture of their (micro-) services and thus contribute to business-IT-alignment in a new way. Nevertheless, a central enterprise architecture management (EAM) function is still required for supporting the teams regarding cross-team and cross-service issues. Furthermore, as many companies still run the traditional IT function side-by-side with the new IT function, the EAM functions of both parts have to cooperate. Based on a single case study, we discuss the emergence of a new EAM function ({''}fast IT EAM{''}), changing tasks and processes, implications for EA models and challenges for the integration of the traditional EAM and the fast IT EAM functions.