I'm pretty sure Tesla doesn't want to take Trade-Ins.
Trade in value with tesla on my Model X is 5-12k less than the KBB trade in range (good condition). Looking at the used X's tesla has, the closest to my specs with over 10k miles more than mine is $17k more than their trade in offer...
I've been getting a trade in quote every couple months just to see if it's worth moving to a new Y, their trade in value has dropped $9k over the last 18 weeks... Note that my X is a 2016 (HW2 with FSD paid for), it shouldn't be dropping that fast at this point.