I have a new 2023 Defender HD10. Today when I was trying to go through a steep ditch at an angle one of the rear tires came off the ground a little when the suspension was flexing and it started spinning and would not move. I flipped the switch to lock the rear diff and still only the tire off the ground would spin. So I backed up, then tried locking it again, tried to drive back through the ditch the same way and still only the tire with no load on it would spin. So I’m not sure my rear diff lock is working. Any advice?