Why This GamePass Script Not Running after added pcall()?

After I added the pcall() modifications, it stopped working, and even before that it didn't work 100% of the time. Any errors you can spot?

function isAuthenticatedforBlowgun(player) -- checks to see if the player owns your pass
    return game:GetService("MarketplaceService"):PlayerOwnsAsset(player, 483225340)
end

function isAuthenticatedforSlots(player) -- checks to see if the player owns your pass
    return game:GetService("MarketplaceService"):PlayerOwnsAsset(player, 483221291)
end

while wait() do
    for _,plr in ipairs(game.Players:GetPlayers()) do
        local success, message = pcall(isAuthenticatedforBlowgun)
        if success then
            game.ReplicatedStorage.GamepassEvent:FireClient(plr, "Blowgun")
        end
    end
    for _,plr in ipairs(game.Players:GetPlayers()) do
        local success, message = pcall(isAuthenticatedforSlots)
        if success then
            game.ReplicatedStorage.GamepassEvent:FireClient(plr,"4Slots")
        elseif not success then
            print('slots gamepass not working..')
        end
    end
end