Hello there,
I owned an A class 250e from 2021 which I later on swapped for the A3 45 TFSIe and both made this exact same noise. Both were used cars when I bought them but my service car at work is a 330e from 2024 brand new and it started making the exact same noise after a couple of months. It must be debris that get into the breaking pads. If you clean the breaking pads the noise will stop for a while but it will eventually come back. I drive all the cars on EV mode most of the time but if I turn the engine on its barely noticable.
