A Player Cant See Another Player Team?

I Was Testing My Game With Some Friends And I Noticed When My Friends Changed Team I Didn't See That He Had Changed Team And I Don't Know Why?

Here Is The Local Script

script.Parent.Visible = true
local plr = game.Players.LocalPlayer

script.Parent.Guard.MouseButton1Click:Connect(function()
	script.Parent.Visible = false
	plr.Team = game.Teams.Guard
	script.Parent.BillboardGui.TextLabel.Text = "Guard"
	script.Parent.BillboardGui.Parent = plr.Character.Head
end)

script.Parent.CoreManager.MouseButton1Click:Connect(function()
	script.Parent.Visible = false
	plr.Team = game.Teams["Core Manager"]
	script.Parent.BillboardGui.TextLabel.Text = "Core Manager"
	script.Parent.BillboardGui.Parent = plr.Character.Head
end)

script.Parent.ControlRoom.MouseButton1Click:Connect(function()
	script.Parent.Visible = false
	plr.Team = game.Teams["Control Room Manager"]
	script.Parent.BillboardGui.TextLabel.Text = "Control Room Manager"
	script.Parent.BillboardGui.Parent = plr.Character.Head
end)

I Need Some Help With This