If one does a little online research they will learn that the FBW S-92 was originally required by contract with Canada to be FAA certified.
While no doubt an excellent aircraft in many ways, the FAA would not certify the aircraft due to numerous concerns. The FBW system was a major FAA issue. In the end Sikorsky and Canada renegotiated the aircraft contract to drop the FAA requirement.
Sikorsky I was told made the mistake in assuming the FAA would accept a FBW system designed to military standards and requirements. Additionally the FAA was brought in late in the aircraft FBW development.
Based on what I have read, Leonardo and Bell have been working closely with the FAA from day one.