Audi sport diff....no longer functions

Anyone have this happen to them? I am taking it back to the dealer but curious if anyone has encountered this. It says “stability control fault” when I do a code scan via carista. It no longer vectors torque. I just tried now with esc fully off and no dice. Sad face. Fwiw there is no leaking dff fluid, and no constant error light on the dash. But the diff definitely doesn’t vector torque anymore. It’s fully open all of the time