Why is a Item not cloning into a player backpack?

I'm trying to make a dialog shop, when you use the dialog it will clone the item into your backpack.

But it never works, and the output didn't say anything. What did I do wrong?

(the items are in ReplicatedStorage and it is a server-sided script.)

local witchbrew = game.ReplicatedStorage.WitchBrew:Clone()
local bloxcola = game.ReplicatedStorage.BloxyCola:Clone()


script.Parent.DialogChoiceSelected:connect(function(player,choice)
    if choice.Name == "Bloxycolaprompt" then
        bloxcola.Parent = player.Backpack

    elseif choice.Name == "Witchesbrewprompt" then
        witchbrew.Parent = player.Backpack
    end
end)