You're implementing a FIDO-based authentication system for your customers who have a variety of hardware keys, platform authenticators, third party passkey providers, browsers, and operating systems. As you roll out your implementation there is one thing that is inevitable: bugs! With the possibility of a bug existing in any of these components it is difficult - if not impossible - to test all possible combinations. As your implementation scales upwards rare bugs will be encountered by your users more frequently. This leads to the question, "How do you debug customer impacting issues with your FIDO implementation?" In this master class, we'll share with you the lessons learned from our own rollout of FIDO to AWS customers, including some of the difficult to resolve bugs we identified. Learn how to debug FIDO implementation issues in a scalable, repeatable manner by collecting necessary data from customers and server-side logs. We'll review how to identify sources of known issues in browsers, operating systems, authenticators, and server-side FIDO implementations. Attendees will walk away with actionable information to help them diagnose and debug their own FIDO implementations.