For loop not printing when adding a player into a table?

Hello there. Currently, I am trying to make a system where a player joins the game, they have a bool value in their player, and when they press a button in the main menu GUI, the bool value goes away ( Don't worry I already have the bool value system that goes away when they press a GUI ) and they are added into a table in a script. But the problem is that when I want it to print something when a player joins the table, it doesn't print anything.

local contestants = {}

for _, v in pairs (game.Players:GetPlayers()) do

     if not v:FindFirstChild("CanPlay") then
          table.insert(contestants, v)
          print("A player has been added to the contestants") 
      end
end

Any answers are accepted. Thank you for your time. Stay safe. ShortTeamROBLOX

This is the script I used for the PlayerAdded:

local InMenu = {}
local contestants = {}

game:GetService("Players").PlayerAdded:Connect(function(plr)
	if plr:WaitForChild("CanPlay", 7) then
		table.insert(InMenu, math.random(), plr)
		warn("A Player has join the InMenu table")
	end		
					
	for _, v in pairs(game:GetService("Players"):GetPlayers()) do
		if not v:WaitForChild("CanPlay") then
			table.remove(InMenu, math.random())
			table.insert(contestants, math.random(), v)
			warn("A player has been added to the CanPlay table")
		end	
	end
end)

This only fires when I join the game though.