MouseButton1Up/Click Event is not firing?

I got a problem where my MouseButton1Up Event is not firing. I tried anything and I am not sure why is it not firing.

My code in Local Script children of my Image Button:

local player1Frame = script.Parent.Parent.Player1Offer
local AcceptTrade = game:GetService("ReplicatedStorage").Functions.AcceptedTradeRequest

script.Parent.MouseButton1Up:Connect(function()
    print("CLICKED NOOB!") -- debugging purposes
    local givenPets = {}
    for i, v in pairs(player1Frame.Offer:GetChildren()) do
        if v:IsA("ImageLabel") then
            table.insert(givenPets, v.Name)
        end
    end
    table.foreach(givenPets, print) -- for debugging purposes
    local result = AcceptTrade:InvokeServer(givenPets)
end)