Update: like many others, the service department ordered a new axle and said the part was on a 30 day back order. They gave me the truck, saying it was safe to drive on a cross-country trip I was making, but told me to keep an eye on the fluid level - which I did. about 1500 miles in, it got to...
Joining the club. 2021 Willys, 8k miles. Not sure how long this has been going on, just noticed yesterday while installing a hitch receiver. 2 joints deep inside the diff to get to fluid.
Appointment at the dealership tomorrow morning.