I had this on a 2002 vw passat.
Its the rear tyres, they wear funny and you get “saw tooth effect” on them and it creates the noise you speak of.
Try swapping your wheels front to back to see if it cures it.
Cheers
Steve
I had this on a 2001 Passat, there was almost a chunk of tread missing every 5cm or so on the inside edge of the tyre, moved them to the front first, the noise was ridiculous, replaced the damaged tyres and had 4 wheel alignment done as well – 20k on and it’s fine.