I followed the blog post, but now devices my IOT no longer have an internet connection; It seems to be one way only. The MX sees the devices (on the dashboard), but I can’t ping them from the dashboard, and the Apple TV’s no longer have internet access.
I would go through the blog again with a fresh set of eyes and see if you notice where you have gone wrong. Failing that I would just call into support, its included in the cost of the license and they should be able to work this one through with you.
Ive spent way too long looking at a setup that should work and finally when I've swallowed my pride and called support they have picked it up in 2 minutes. Sometimes you get abit blind looking at the same setup for so long.