I need help integrating steam into a project

I have been following this tutorial pretty smoothly up until now. At the end of this video he integrates the Steam sub system into the game. The video was made on 4.11 so everything is a little different, but I did basically exactly what he did and its not working. I have checked the online platform plugin for steam and tried everything I can think of to get it to work, but I am stuck. I am also on Mac so that might be contributing to the problem but I’m not sure. Help. Im using version 4.21.2.