(Post 11) that’s why I suggested you start at the transfer case and go towards the hubs.....now you know your hubs aren’t engaging....Maybe. Can’t see in your video, did you check your axles/u-joints coming out of the front differential to see if either side is rotating? Do you still have the hubs in the “Lock” position? You can turn the front wheels and should be able to see the u-joints/axle(s) turning- don’t have to climb under. Then if confirmed (rotation) time to get into the hubs.