Why doesn't my Dialog script work in Roblox Studio play test but not in a server?

I've been trying to make a Dialog to sell an item, the script (its a server script btw) works in Studio, but in a local server it doesn't work at all, it doesn't even register the event, the script is under a dialog

local this = script.Parent
local sellEvent = game.ReplicatedStorage.Remotes:WaitForChild("sellDialogEvent")

function CalculateGain(count,value)
    return count * value
end

this.DialogChoiceSelected:Connect(function(plr,dialog)

    if dialog == this.sell then
        local obj =  plr.Backpack:FindFirstChild("Cute") or plr.Character:FindFirstChild("Cute")
        if obj then
            local count = obj:WaitForChild("Count").Value
            local value = obj:WaitForChild("Value").Value

            local reward = CalculateGain(count,value)

            plr.leaderstats.Gold.Value = plr.leaderstats.Gold.Value + reward
            obj:Destroy()

            dialog.ResponseDialog = "Nice business with ya, enjoy your reward!"




        end
    end
end)

I've tried testing the event if it registers with a test script but it doesn't work either.

script.Parent.DialogChoiceSelected:Connect(function()
    print("test")
end)

So, why doesn't it register? Please help!