Why isnt my script iterating through the players in game?

local playerService = game:GetService("Players")
local players = playerService:GetPlayers()

for _, player in pairs(players) do
	local int = Instance.new("IntValue")
	int.Name = "playersLeft"
	int.Value = false
	int.Parent = player
	print("playersFound")
end

and my script is in serverScriptService

This simple script will go through all players and adds a bool value to each player

local playerService = game:GetService("Players")
local players = playerService:GetChildren()

for _, player in pairs(players) do
    local bool = Instance.new("BoolValue")
    bool.Name = "playersLeft"
    bool.Value = false
    bool.Parent = player
end

you can check if the script works by going in players and see if there is a bool value called playersLeft. Hope this helps