[UNITY TEAM]Can't pass Apple review team for Mac Appstore

Hello,

I am stuck for two weeks.
Got 12 rejections.
It looks like I am walking in circles.

Apple rejected my game:
"We found that your app incorrectly implements sandboxing.

Specifically, we found that your app provides the following functionality but is missing the associated entitlement:

- functionality: Game Center
- required entitlement: "com.apple.developer.game-center"

Then I added game center entitlements and still got rejection:
"Your app still contains the Game Center entitlement, but it does not link against the GameKit framework.

Next Steps

If you do not intend to use Game Center, please remove the Game Center entitlement. "

So the question is:
Why is GameKit not included in Unity?
What should I do to pass the review team?