I heard this noise on my 2019 Atlas S with 4Motion. Turning and accelerating. Sounds sort of like what you are describing, but to me it was similar to an exhaust shield (light weight metal) coming in contact with something vibrating...sort of like wind noise I guess. Same duration you mentioned.
Likely to be a TSB in the future...it doesn't sound like anything is damaged, more like something vibrates.
Also, I did not come to a complete stop, this was a likely second gear pull. These Asin transmissions don't down shift to first unless you come to a complete stop...so I wondered if lug in second (up a hill in my case) had anything to do with amplification. Will report to dealer when I go in for my first appointment.
Please post if you find out what it is...