I have this noise, after 10k miles it developed. It started doing it only in the even gears and now the odd ones as well.
The clutch is shot and needs to be replaced. It is exhibiting the "Green" clutch break in symptoms but well after the break in period. It's very clear, but the dealerships are not very helpful (lack of DCT training?).
First you'll just hear the grinding, especially at low RPM pulls. Then you'll notice that sometimes you're driving a CVT because the clutch is sooo slowww to let out. Then you'll notice power loss when accelerating while it's doing this slow engaging or grinding. You'll notice surges in acceleration, it'll feel almost like gentle bumps in the road. Sometimes the grinding will turn into heavy chatters that vibrate the whole car, sounding like a helicopter hovering, and cause pulsing torque steer.
All these problems and all it needs is a new clutch, but no one wants to touch it. Good luck getting it fixed.