Your going to have find out where it’s eminating from. The most likely cause is the split seats rubbing together on the sides—felt between the two will eliminate it. Your car should still be under the bumper to bumper warranty. Figure out how to recreate the sound and take it in and show it to the service advisor.
Infiniti is good at fixing rattles and squeaks if they can reproduce it. When my car was new the cover in the front camera behind the rear view mirror was buzzing—I could reproduce it by lightly pounding I the front windshield. Showed it to the advisor who fixed it with self adhesive foam padding. A few days later they had me bring it back in because Infiniti sent an engineer to study the cause...that was a first! They replaced it with a new one.