Does Gui need Remote Event when FE is on?

I have a Gui and a gui script

while wait() do
	script.Parent.Text = ""..game.Workspace.Message.Value
end

but it did not work correctly! What I want it to do is to show the message, but it only worked for studio testing but not for real roblox why?

Example:

I use this script to change the Value of the message.

while wait() do
	if script.Parent.Value >= 2 then 
		script.Parent.Parent.GameScript.Disabled = false
	elseif script.Parent.Value < 2 then
		script.Parent.Parent.GameScript.Disabled = true
		script.Parent.Parent.Message.Value = "2 Players or more are needed to play a minigame!"
		
	end
end

and I use the gui script above to change the gui text that the text that shows on the MessageBoolValue, It did work in studio but did not work in real roblox!!

https://cdn.discordapp.com/attachments/456967793397727233/480354762517118997/ Screenshot_10.png

As you can see above, it shows the message in studio, but when in real roblox:

https://cdn.discordapp.com/attachments/456967793397727233/480355193616203776/ Screenshot_11.png

As you can see now, when I am in real roblox it does not show anything.

here is another example

function Intermission()
	for i = 10,1,-1 do -- Change 5 for the time interval of intermission
		wait(1)
		Message.Value = "Intermission: "..i.." second(s)"
	end
end

function SelectMap()
	for i = 1,#AllMaps do
		if AllMaps[i]:isA("Model") then
			table.insert(choices,AllMaps[i])
		end
	end
	MapSelected.Value = choices[Picked].Name
	Message.Value = "Minigame Selected: "..MapSelected.Value.."!"
end

Does this mean that I need to add a remote event??

*If you need more example or for script tell me in the comment.