My Gamepass Script is not 100% correct, it doesnt authorize every time?

By not efficient, I mean that it doesn't fire to the client enough and sometimes doesn't fire to the client at all! Help!?

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

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

while wait(1) do
    for _,plr in ipairs(game.Players:GetPlayers()) do
        local success, message = pcall(function() isAuthenticatedforBlowgun(plr) end)
        if success and isAuthenticatedforBlowgun(plr) == true then
            game.ReplicatedStorage.GamepassEvent:FireClient(plr, "Blowgun")
        end
    end
    for _,plr in ipairs(game.Players:GetPlayers()) do
        local success, message = pcall(function() isAuthenticatedforSlots(plr) end)
        if success and isAuthenticatedforSlots(plr) == true then
            game.ReplicatedStorage.GamepassEvent:FireClient(plr,"4Slots")
        end
    end
end