Why does DataStore:GetAsync return an empty table / nil value every time?

First, my code:

local DATASTORESERVICE = game:GetService("DataStoreService")
local toolStore = DATASTORESERVICE:GetDataStore("-tools")
game.Players.PlayerRemoving:Connect(function(player)
    pcall(function()
        local tools = {}
        for _,v in pairs(player.Backpack:GetChildren()) do
            table.insert(tools,1,v)
            print("Saving: "..v.Name)
        end
        for _,v in pairs(player.Character:GetChildren()) do
            if v:IsA("Tool") then
                table.insert(tools,1,v)
                print("Saving: "..v.Name)
                break
            end
        end
		local own = {}
		for i,v in pairs(game.ServerStorage:GetChildren()) do
			if tools:FindFirstChild(v.Name) then
				table.insert(own,i,true)
			else
				table.insert(own,i,false)
			end
		end
        toolStore:SetAsync("-tools"..player.UserId,own)
    end)
end)

game.Players.PlayerAdded:Connect(function(player)
    local success,value = pcall(function()
        local tools = toolStore:GetAsync("-tools"..player.UserId)
    end)
	if value ~= nil then
		local own = value
		for i,v in pairs(own) do
			if v == true then
				local tool = game.ServerStorage:GetChildren()[i]:Clone()
				tool.Parent = player.Backpack
			end
		end
	end
end)

This is all 1 script. I am trying to store which weapons a user leaves the game with, so that when they re-enter the game, they have those same weapons.

Currently, it seems to save just fine. I have tried saving a string, and it ends up returning an empty table when I use GetAsync.

Why does this not work, or what would I need to do to make this work?

If you have any further questions, please ask them. I really need to get this fixed.