This conference talk explores the complex challenge of designing scalable access control systems for multi-tenant environments with millions of resources. Follow the Grafana Access squad's journey as they migrate to OpenFGA, a CNCF sandbox project, to address issues like poor search performance, feature inconsistency, and multi-tenant schema discrepancies. Learn practical strategies for platform engineers supporting access control in large-scale systems, including how to orchestrate a migration from existing access control systems and navigate the unique challenges of developing security-critical systems. Discover how to transition from chaos to control in your access management approach through real-world experiences shared by experts from Grafana Labs and Okta.