Ah, seems like you would have a reason to return, if that sound annoys you enough 😀
But then, you can return for no reason at all, if you simply don't like it.
But, to answer your main question, the sound is a normal-enough kind of a sound --- but shouldn't be any sound at all at that location, like the other areas on that hinge cover.
And, not something that most folks would ever notice --- and not likely affecting anything.
So, your response now is up to you. If you don't like the sound, return your MBPro.