Data saving script returns "true" to pcall, but it dosen't save the data. What is the problem??

So i was making a really unnecessary OS thing but when i try to save data (a remote event fired from a local script) it says on the output that it succed but it returns a nil value when i try to GetAsync. I'm not an expert on scripting so i'm wondering what i did wrong. Last time this happend was then i tried to save on PlayerRemoving. it couldn't save because the game was shutting down before the function even began executing. But this script saves 3 values when a TextButton is clicked.

LocalScript on PlayerGui:

local RE = game.ReplicatedStorage:WaitForChild("SettingsPromptSave")
script.Parent.MouseButton1Click:Connect(function()
    script.Parent.Parent.Parent.PromptMenu.Visible = false
    RE:FireServer(game.ReplicatedStorage.Theme.Value, game.ReplicatedStorage.Wallpaper.Value)
    print("Event Fired")
end)

DataSaveScript on ServerScriptService:

dss = game:GetService("DataStoreService"):GetDataStore("FirstJoin2")
dsstheme = game:GetService("DataStoreService"):GetDataStore("SettingsThemeSave2")
dsswallpaper = 
game:GetService("DataStoreService"):GetDataStore("SettingsWallpaperSave2")

game.ReplicatedStorage.SettingsPromptSave.OnServerEvent:Connect(function(player, theme, wallpaper)

local saved, failed = pcall(function()
   dss:SetAsync(player.UserId, true)
   dsstheme:SetAsync(player.UserId, theme)
   dsswallpaper:SetAsync(player.UserId, wallpaper)
end)

if saved then
    print("First time loign is false")
else
    warn(failed)
end
end)

DataLoaderScript on ServerScriptService:

dss = game:GetService("DataStoreService"):GetDataStore("FirstJoin2")
dsstheme = game:GetService("DataStoreService"):GetDataStore("SettingsThemeSave2")
dsswallpaper = game:GetService("DataStoreService"):GetDataStore("SettingsWallpaperSave2")

game.Players.PlayerAdded:Connect(function(player)
local playergui = game.ReplicatedStorage
local set, failed = pcall(function()
    playergui.LoginBefore.Value = dss:GetAsync(player.userId)
    playergui.Theme.Value = dsstheme:GetAsync(player.userId)
    playergui.Wallpaper.Value = dsswallpaper:GetAsync(player.userId)
    wait(1)
end)
if set then
    print("Values Set")
else
    warn(failed)
end
end)