The 2023 model has a "pedestrian safety signal" so pedestrians can hear your approaching EV. Could that be your noise?
I have a 2022 EUV, which doesn't have this feature, so I can't describe its sound.
The 2022 EUV does have this "feature".
From page 76 in the 2022 EUV manual:
Pedestrian Safety Signal
The vehicle is equipped with automatic sound generation.
The automatic sound is generated to indicate the vehicle presence to pedestrians.
United States
The sound changes if the vehicle is speeding up or slowing down.
It is activated when the vehicle is shifted into a forward gear or R (Reverse), up to 33 km/h (20 mph).
Canada
The sound changes if the vehicle is speeding up or slowing down. It is activated when the vehicle is shifted into a forward gear or R (Reverse), up to 23 km/h (14 mph).