ChatMakeSystemMessage isn't working through player.Added, help?

Trying to make it so that it'll create a system message prompt in the chat when someone joins the game, but it isn't working. I'm doing this through a local script.

game:GetService("Players").PlayerAdded:Connect(function(Player)  --Event for when a player joins
	game.StarterGui:SetCore("ChatMakeSystemMessage", { --SetCore thingy
 		Text = Player.Name.." joined the game."; --Changes text
 		Font = Enum.Font.SourceSansSemibold; --Changes font
		Color = Color3.fromRGB(255,255,255); --Changes color
		FontSize = Enum.FontSize.Size96; --Changes fontsize
	})
end)

If you place this code into a ServerScript and read the output, you should notice that the game will warn that StarterGui:SetCore can only be called from a LocalScript

With this in mind, you will require a RemoteEvent to ask the Client to make this message in their chat. Since we presumably want all players to see the message, we need to use the :FireAllClients() method of RemoteEvents

REVISED SERVER SCRIPT under ServerScriptService

local remote = Instance.new("RemoteEvent")
remote.Name = "JoinServer"
remote.Parent = game:GetService("ReplicatedStorage")

game:GetService("Players").PlayerAdded:Connect(function(Player)
	remote:FireAllClients(Player.Name)
end)

REVISED LOCAL SCRIPT under StarterGui

local remote = game:GetService("ReplicatedStorage"):WaitForChild("JoinServer")

remote.OnClientEvent:Connect(function(name)
	game:GetService("StarterGui"):SetCore("ChatMakeSystemMessage", {Text = name.." joined the game."; Font = Enum.Font.SourceSansSemibold; Color = Color3.fromRGB(255,255,255); FontSize = Enum.FontSize.Size96})
end)