why wont it put a count down when you are spawned in the map?

You spelt roundLength ad Destroy wrong, you silly goose!

Try this:

local status = game.ReplicatedStorage.Status

local Maps = game.ReplicatedStorage.Maps:GetChildren()

local Maps = game.ReplicatedStorage.Maps:GetChildren()

while true do
    for i = 1, 10 do
        status.Value = "Intermission " .. 10 - i
        wait(1)
    end
    local Random = math.random(1, #Maps)

    local map = Maps[Random]:Clone()
    map.Parent = workspace

    status.Value = "Todays Challenge Will Be " .. map.Name
    wait(4)

    local players = game.Players:GetChildren()
    for i = 1, #players do
        if players[i].Character ~= nil then
            local spawnLocation = math.random(1, #workspace.Teleports:GetChildren())
            players[i].Character:MoveTo(workspace.Teleports:GetChildren()[spawnLocation].Position)
            players[i].Character.Parent = workspace
        end
    end

    local roundLength = 20
    local canWin = true

    if map:FindFirstChild("Obby") then
        map.EndPart.Touched:Connect(
            function(hit)
                if hit.Parent:FindFirstChild("Humanoid") then
                    canWin = false
                    status.Value = hit.Parent.Name .. "Has Beaten This Deadly Challenge"
                end
            end
        )
    end

    repeat
        roundLength = roundLength - 1
        status.Value = "Time Remaining"
        wait(1)
    until roundLength == 0 or canWin == false or #workspace.ingame:GetChildren() == 0

    wait(3)
    map:Destroy()
end