Live access reviews, which involve reviewing and certifying user access to various resources, should be performed in a production environment. This is because access reviews are directly related to active identities and entitlements in a live system, ensuring compliance and security in real-time operations.
Key Reference from SailPoint Documentation:
Access Reviews in Production: SailPoint recommends conducting live access reviews in production environments to ensure that the access being reviewed reflects the actual, current access of users in the system.