Crunching sound selecting and engaging reverse gear

[Optimus]

Hi all, recording this as a current problem in my MY23 Avant TDI40 Quattro.

Currently become an issue when reversing at low speeds car has covered 19k miles.

Non-obvious symptoms other than someone pointing this out to me in the car park. I can’t hear it in the cabin but it’s coming from the rear of the car not the front. It’s replicated by going forward and selecting reverse and throttle. 

sound is a distinct crunch/grinding sound only at low speed after selecting reverse.

further input after taking it in for diagnosis at main dealer.

[Steve Q]

Definitely recommend getting it to a main dealer. 

Could it be an issue with the synchromesh, linkage or an issue with the quattro system.