UE docement Buoyancy tutorial didnt work

HI guys and unreal engine developer

I am working on naval video game and followed that tutorial Water Buoyancy Component in Unreal Engine | Unreal Engine 5.7 Documentation | Epic Developer Community to the letter trying to learn water system for my game. Unfortunately pontoons didn’t have any effect on the boat and it kept sinking.

Am I doing something wrong?

here is a link to a video showing what is happening