When the AD FS role is installed, there are few related components we need to be aware of. Before Windows Server 2012 R2, there were four AD FS roles services: the federation service, the federation service proxy, the claim-aware agent, and windows token-based agent (to support the AD FS 1.x interoperability). These are no longer available as role services; and when go to install AD FS, it will only have the Federation Service role.