I have the same problem with mine. It makes this creaking sound which I noticed in the middle bottom, on the palm rests and sometimes when the hinge opens.
It's unfortunate that I noticed this during quarantine and Apple stores are closed cause now I just have to live with it.
Noticed that this is from 3 years ago though. DID you get it fixed?
This is happening with my mid 2019 MacBook Pro 13" 4tb.
Mine does the same thing. Even after removing the bottom and re-seating (which happened because i was replacing the thermal paste to fix the overheating), it still does it. I think it's just the way it's designed. It is thin aluminum and there are a lot of components inside...I think it flexes some when picked up
I feel like I just flexed it too much cause now my hinge is slightly inconsistent in feel. Its too stiff sometimes and other times when I press a lil above the Touch Bar, it becomes slightly easier to move.
This happens when I have it in the almost completely open stage.
I'm seriously scared that the Genius Bar will just ignore the issue.