Heard from Tablo Tech support. Port forwarding was fine. Their suggestion was to delete my Tablo from my cell phones, tablets and computers. Then inside my network do a scan and re-sync. Then try outside of my network. It worked on both cell phones. I will go to another network sometime today and test the tablet, but my guess is that it will work.
So, interesting that the devices connected inside the network just fine and the router was configured properly, but the devices all had bad connection info. My theory is that something changed in the last few firmware updates, but the devices did not pick up on it.