UI is not updating for all the Clients. RemoteEvents issue..?

[IGOTHISLOL]

Well, you can try it. It’s a server script after all and there are no remote events. Here’s what I did and it worked!

local RS = game:GetService("ReplicatedStorage")
local UI_tag = RS:FindFirstChild("UI")
local VotingTime = RS:FindFirstChild("VotingTime")

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		UI_tag:Clone().Parent = character.Head
		player.PlayerGui.UI.Adornee = character.Head
		
		VotingTime.Changed:Connect(function()
			if VotingTime.Value == true then
				for _, v in ipairs(game.Players:GetChildren()) do
					if v:IsA("Player") and v ~= nil then
						local playerGui = v.PlayerGui
						playerGui.UI.Main.Visible = true -- Reference your UI.
					end
				end
			else
				for _, v in ipairs(game.Players:GetChildren()) do
					if v:IsA("Player") and v ~= nil then
						local playerGui = v.PlayerGui
						playerGui.UI.Main.Visible = false -- Reference your UI.
					end
				end
			end
		end)
	end)
end)

[ComplexMetatable]

You can try to change your code to this:

local RS = game:GetService("ReplicatedStorage")
local UI = RS:FindFirstChild("UI")
local VotingTime = RS:FindFirstChild("VotingTime")


game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		UI:Clone().Parent = player.PlayerGui
		player.PlayerGui.UI.Adornee = character.Head
		
		while wait() do
			if VotingTime.Value == true then
				for _, v in ipairs(game.Players:GetChildren()) do
					if v:IsA("Player") and v ~= nil then
						local playerGui = v.PlayerGui
						playerGui.UI.Main.Visible = true -- Reference your UI.
					end
				end
			else
				for _, v in ipairs(game.Players:GetChildren()) do
					if v:IsA("Player") and v ~= nil then
						local playerGui = v.PlayerGui
						playerGui.UI.Main.Visible = false -- Reference your UI.
					end
				end
			end
		end
	end)
end)

[IGOTHISLOL]

Sorry, I meant this was the code I used

local RS = game:GetService("ReplicatedStorage")
local UI_tag = RS:FindFirstChild("UI")
local VotingTime = RS:FindFirstChild("VotingTime")

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		UI_tag:Clone().Parent = character.Head
		character.Head.UI.Adornee = character.Head
		
		VotingTime.Changed:Connect(function()
			if VotingTime.Value == true then
				for _, v in ipairs(game.Players:GetChildren()) do
					if v:IsA("Player") and v ~= nil then
						local playerGui = v.Character.Head.UI
						playerGui.Main.Visible = true -- Reference your UI.
					end
				end
			else
				for _, v in ipairs(game.Players:GetChildren()) do
					if v:IsA("Player") and v ~= nil then
						local playerGui = v.Character.Head.UI
						playerGui.Main.Visible = false -- Reference your UI.
					end
				end
			end
		end)
	end)
end)

[Clueless_Brick]

While this is the only solution so far, I’m still a bit hesitant to use this code due to an ongoing bug.

Client destruction of character objects replicates to server

While developing an anticheat, I discovered that exploiters can destroy any individual object in their characters, including non-physical items like decals, joints, and scripts, and that destruction replicates to the server. This behavior is also not documented where it should be. This can happen pretty much everywhere that uses the default characters familiar to Roblox players, and is not limited to Roblox Studio. For example, if I run this script on my client, my limbs and t-shirt disappear …

Client destruction of character objects replicates to server

This also applies to objects you insert. So if your game has “Health” and “Mana” values for example, they can delete these and break your scripts. Don’t store anything in the Character (even though it’s the most intuitive place) I made a proposal before to add a new property to fix this a while back:

I’m trying to steer away from placing things inside the character (because I did it a lot).

EDIT: But if this is the only way to do what I’m trying to do, then so be it I guess

[IGOTHISLOL]

i mean what’re they gonna do? not see the voting script?

[Clueless_Brick]

I don’t want exploiters being able to view anybody’s BillboardGui through the character because later on I’m going to be relying on them as a voting system with a little number off to the side.

Furthermore, if the bug stated above is true, I don’t want an exploiter deleting their BillboardGui, ultimately giving them the benefit of not allowing players to see their suspicion meter.

EDIT: Ultimately I’ve settled on putting the BillboardGui inside the Head of the player. I’ll just have to come up with ways on how I can counter this if the Client somehow deletes the UI.