Text not changing for player with no error?

I made an afk mode button and the text is supposed to change. Here is the script:

This creates the afk value:

local AfkMode
local playerSettings

local players = {}

game.Players.PlayerAdded:Connect(function(player)
    table.insert(players, player.Name)

    -- Settings for the player
    playerSettings = Instance.new("Configuration")
    playerSettings.Name = "Settings"
    playerSettings.Parent = player

    -- Afk
    AfkMode = Instance.new("BoolValue")
    AfkMode.Name = "Afk"
    AfkMode.Parent = playerSettings
    AfkMode.Value = false
end)

And this changes the text on the button (on/off):

game.StarterGui.Settings.AfkModeButton.MouseButton1Click:Connect(function(player)

    local AfkModeButton = player.PlayerGui.Settings.AfkModeButton
    local AfkMode = player.Settings.Afk

    AfkMode = not AfkMode.Value

    if AfkMode.Value == false then
        AfkModeButton.Text = "AFK Mode: Off"
    elseif AfkMode.Value == true then
        AfkModeButton.Text = "AFK Mode: On"
    end
end)

Nothing happens when I click, whats wrong?