Humming noise while in park

Got this humming noise coming from underneath the truck while in Park. It only happens when in Park and idling. I can’t exactly pinpoint the location of it, but it’s definitely coming from underneath the truck. Hopefully the audio does it justice. But any ideas?

https://youtube.com/shorts/SgzpJD5Sfh8?feature=share

 

Sounds like a bearing. Similar noise to a bad wheel bearing. Which one, I’m not sure. Hope it’s not involved with your crank shaft bearings.

 

I had to put on headphones to hear what I think is it. Does it sound like an off-beat pulsing sound of someone blowing over the mouth of a coke bottle in person?

 

Yeah, very similar to that. It ONLY happens in Park though. Even while idling and in Drive, it stops. But it’s like that slight humming that’s off beat