Rigid body kick over network (DEADLINE)

I have a game with a ball. Players can join in and everything looks fine and their position sync perfectly. My problem is that when the client player tries to kick the ball with the kick script the ball doesn't move, like it doesn't register the add force. The client player can only slightly push the ball, but it feels extremely heavy.

I'm a student and this is my first time making a networked game so any help is very much appreciated. I'm using UNET so I'm just using the standard network...

Rigid body kick over network (DEADLINE)