tecknik s4

I’ve had my car for about 2 years and ever since last summer it’s been making a terrible sound on low speed acceleration (intermittent) some times I can make it happen every time I accelerate other times I struggle to get the car to make the noise completely.
I just took it to my nearest Audi dealer as I’m still under warranty ( only for another month) and they don’t know what the issue is and they were not able to recreate the noise either so if anyone can help me try narrow it down that would help a lot!
2019 s4 stock except for intake