Hello everyone,
I have the same problem with my car. I hear the noise when accelerate and it stops when the gas pedal is released. It is not always present, meaning that on some days it works perfectly fine. l have checked with a two different mechanics that have a lot of experience fixing automatic transmitions and both said that dual mass flywheel is getting worn out. It is not urgent to be replaced, but it should be done in the next 10-20k kilometers.
Sorry for eventual typing mistake as English is not my native language.