How to use / as a key function?

I am making custom chat, I tested everything it works with the enter button as the fire on the KeyDown() but I want it to be / but when I have it set it works in studio but not in player...

heres the script if you need it

wait(.5)
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local able = false
local default = script.Default

function ondown(key)
    if key:byte() == 13 and able == false
    then
    able = true
        script.Parent:TweenSizeAndPosition(UDim2.new(1,0,.05,0), UDim2.new(0,0,.45,0), "Out", "Quad", .5, true)
        script.Parent.TextXAlignment = "Center"
        script.Parent:CaptureFocus()
    end
end

function clear(e)
    if e == true
        then
        game.Workspace.Fabrication_Framework.CoreGui_Script.Chat.RemoteFunction:InvokeServer(script.Parent.Text)
        print("Sent")
    end
    script.Parent:TweenSizeAndPosition(UDim2.new(1,0,.025,0), UDim2.new(0,0,.975,0), "Out", "Quad", .5, true)
    script.Parent.TextXAlignment = "Left"
    able = false
    script.Parent.Text = default.Value
end

script.Parent.FocusLost:connect(clear)
mouse.KeyDown:connect(ondown)