Prop Hunt Blind Character

Hello! I’m trying to make a small prop hunt game, but my multiplayer knowledge is almost 0.I made a system that spawns the players and they randomly get picked to be prop or hunter.Now I’m trying to make the hunters blind at the start of the game by putting a black widget on the screen but it’s not working.When the client is the prop he gets blinded instead and when the server is prop they both get blinded.
This is where I’m trying to blind the character

This is how I spawn the players

This is where I set if the character is a hunter or prop.

Thank you in advance!