[SOLVED] This whitelist system that uses Datastore is not working and doesn't output any error?

(Edit: fixed OnServerEvent and updated the GUI Code)

So I am making a Datastore whitelisting system, basically I can whitelist, unwhitelist, or view who is whitelisted via a GUI.

How my system works is to use RemoteFunctions (to return stuff, also don't get confused if the RemoteFunction name is UTGJRemoteEvent)

The problem is that my code doesn't work and doesn't output any error. And yes I enabled studio API access. (Because I was testing it on studio). When I clicked whitelist, unwhitelist, or get users whitelisted on my GUI, all of them say that is failed (I made a status system that can say wether it succeded or failed.), and my output says that it failed as well (I added a warn everytime Datastore fails)

Server script: (the datastore and code is classified.)

local DataStore = game:GetService("DataStoreService")
local UTGJDS = DataStore:GetDataStore("classified")

local remote = game.ReplicatedStorage:WaitForChild("UTGJRemoteEvent")
local code = "classified"

game.Players.PlayerAdded:Connect(function(plr)
    plr.Chatted:Connect(function(msg, recipient)
        if string.lower(msg) == string.lower("giveutgj") and not recipient then
            local getallowed, atable = pcall(function()
                return UTGJDS:GetAsync("Username")
            end)

            if getallowed then
                for i, v in pairs(atable) do
                    if plr.Name == v then
                        local cloned = script:WaitForChild("AccessUI"):Clone()
                        cloned.Parent = plr:WaitForChild("PlayerGui")
                    end
                end
            else
                warn("UTGJ get allowed table Datastore Error! Now Retrying..")
                for i = 1, 5 do
                    local getallowed2, atable2 = pcall(function()
                        return UTGJDS:GetAsync("Username")
                    end)

                    if getallowed2 then
                        for i, v in pairs(atable2) do
                            if plr.Name == v then
                                local cloned = script:WaitForChild("AccessUI"):Clone()
                                cloned.Parent = plr:WaitForChild("PlayerGui")
                            end
                        end
                    else
                        warn("UTGJ Update Datstore Error! Retrying..")
                    end
                end
            end
        end
    end)
end)

remote.OnServerInvoke = function(plr, action, username, vcode)
    if vcode == code then
        if action == "Whitelist" then
            local dstable
            local getsuccsess, ctable = pcall(function()
                return UTGJDS:GetAsync("Username")
            end)

            if getsuccsess then
                dstable = ctable
            else
                if type(ctable) ~= "table" and type(ctable) == 'string' then
                    warn("UTGJ whitelisting Datastore Error! Now Retrying..")
                end
                for i = 1, 5 do
                    local getsuccsess2, ctable2 = pcall(function()
                        return UTGJDS:GetAsync("Username")
                    end)

                    if getsuccsess2 then
                        dstable = ctable
                    else
                        warn("UTGJ whitelisting Datstore Error! Retrying..")
                    end
                end
            end

            if dstable then
                table.insert(dstable, #dstable + 1, username)
                local updatesuccess, err = pcall(function()
                    return UTGJDS:UpdateAsync("Username", dstable)
                end)

                if updatesuccess then
                    print("Successfully updated UTGJ username whitelist. New user added: "..username)
                    return true
                else
                    warn("UTGJ Update Datastore Error! Now Retrying..")
                    for i = 1, 5 do
                        local getupdate2, err2 = pcall(function()
                            return UTGJDS:UpdateAsync("Username", dstable)
                        end)

                        if getupdate2 then
                            print("Successfully updated UTGJ username whitelist. New user added: "..username)
                            return true
                        else
                            warn("UTGJ Update Datstore Error! Retrying..")
                        end
                    end
                end
            end
            return false
        elseif action == "Unwhitelist" then
            local dstableunwhitelist
            local getsuccsessunwhitelist, dtable = pcall(function()
                return UTGJDS:GetAsync("Username")
            end)

            if getsuccsessunwhitelist then
                dstableunwhitelist = dtable
            else
                warn("UTGJ unwhitelisting Datastore Error! Now Retrying..")
                for i = 1, 5 do
                    local getsuccsessunwhitelist2, dtable2 = pcall(function()
                        return UTGJDS:GetAsync("Username")
                    end)

                    if getsuccsessunwhitelist2 then
                        dstableunwhitelist = dtable2
                    else
                        warn("UTGJ unwhitelisting Datstore Error! Retrying..")
                    end
                end
            end

            if dstableunwhitelist then
                for a, b in pairs(dstableunwhitelist) do
                    if (username == dstableunwhitelist[a]) then
                        table.remove(dstableunwhitelist, a)
                    end
                end
                local updatesuccessunwhitelist, errunwhitelist = pcall(function()
                    return UTGJDS:UpdateAsync("Username", dstableunwhitelist)
                end)

                if updatesuccessunwhitelist then
                    print("Successfully updated UTGJ username unwhitelist. Removed user: "..username)
                    return true
                else
                    warn("UTGJ Update Datastore Error! Now Retrying..")
                    for i = 1, 5 do
                        local updateunwhitelist2, errunwhitelist2 = pcall(function()
                            return UTGJDS:UpdateAsync("Username", dstableunwhitelist)
                        end)

                        if updateunwhitelist2 then
                            print("Successfully updated UTGJ username unwhitelist. Removed user: "..username)
                            return true
                        else
                            warn("UTGJ Update Datstore Error! Retrying..")
                        end
                    end
                end
            end
            return false
        end
    elseif action == "GetUserWhitelisted" then
        local getusers, usertable = pcall(function()
            return UTGJDS:GetAsync("Username")
        end)

        if getusers then
            return true, usertable
        else
            warn("UTGJ get users whitelisted Datastore Error! Now Retrying..")
            for i = 1, 5 do
                local getusers2, usertable2 = pcall(function()
                    return UTGJDS:GetAsync("Username")
                end)

                if getusers2 then
                    return true, usertable2
                else
                    warn("UTGJ Update Datstore Error! Retrying..")
                end
            end
        end
        return false
    else
        warn("Unauthorized user "..plr.Name.." tried to use UTGJ Whitelister/Unwhitelister.")
    end
end

(I am sorry if it's hard to read)

GUI Code:

local remote = game.ReplicatedStorage:WaitForChild("UTGJRemoteEvent")
local code = ""

local openclose = script.Parent:WaitForChild("Open")
local frame = script.Parent:WaitForChild("Frame")
local usertextbox = frame:WaitForChild("Username")
local whitelist = frame:WaitForChild("Whitelist")
local unwhitelist = frame:WaitForChild("Unwhitelist")
local status = frame:WaitForChild("status")
local getuserframe = script.Parent:WaitForChild("GetUsersUTGJ")
local textgetuser = getuserframe:WaitForChild("Users")
local getuserbutton = getuserframe:WaitForChild("GetUsers")

openclose.MouseButton1Click:Connect(function()
    if frame.Visible == true then
        frame.Visible = false
        getuserframe.Visible = false
    else
        frame.Visible = true
        getuserframe.Visible = true
    end
end)

whitelist.MouseButton1Click:Connect(function()
    if usertextbox.Text ~= "" or usertextbox.Text ~= " " or usertextbox.Text ~= "ItzEthanPlayz_YT" or usertextbox.Text ~= "hellomehaOof" then
        local sucess = remote:InvokeServer("Whitelist", usertextbox.Text, code)

        if sucess then
            status.Text = "Successfully whitelisted the user."
            status.TextColor3 = Color3.fromRGB(0, 255, 0)
        else
            status.Text = "Failed while whitelisting the user."
            status.TextColor3 = Color3.fromRGB(255, 0, 0)
        end
    end
end)

unwhitelist.MouseButton1Click:Connect(function()
    if usertextbox.Text ~= "" or usertextbox.Text ~= " " or usertextbox.Text ~= "ItzEthanPlayz_YT" or usertextbox.Text ~= "hellomehaOof" then
        local sucess = remote:InvokeServer("Unwhitelist", usertextbox.Text, code)

        if sucess then
            status.Text = "Successfully unwhitelisted the user."
            status.TextColor3 = Color3.fromRGB(0, 255, 0)
        else
            status.Text = "Failed while unwhitelisting the user."
            status.TextColor3 = Color3.fromRGB(255, 0, 0)
        end
    end
end)

getuserbutton.MouseButton1Click:Connect(function()
    local sucess, usertable = remote:InvokeServer("GetUserWhitelisted", "a", code)

    if sucess then
        if type(usertable) == "table" then
            for i, v in pairs(usertable) do
                if textgetuser.Text ~= "" then
                    textgetuser.Text = textgetuser.Text.." , "..v
                else
                    textgetuser.Text = v
                end
            end
        else
            textgetuser.Text = "Error. (Not a table.)"
        end
    else
        textgetuser.Text = "An error has occured in the serverside script. Please try again.)"
    end
end)

(Also the string replaced with "no" is me and my friend)

Can anyone help please?

Thanks, Ethan