This paper discusses a reference service model aiming to standardize federated identity management across various scales and scenarios using Enterprise Architecture. Overview:

• Addressing the challenges of managing multiple digital identities in a post-COVID world.
• Development of a universal federated identity management service model (FIMSM).
• Application of the ArchiMate framework for description.

By standardizing complex identity management into a streamlined, service-oriented approach, the model enhances organizational efficiency and interoperability. The implications for security and access management in a distributed work environment are significant, providing a robust framework to tackle these modern challenges effectively.