I’m also getting Registration Error - Unable to add “Tablo” on an iPad Air 2 (Model #: A1567) running iOS 9.3.1. I’m trying to connect to a 4 Tuner Tablo running v2.2.8. I do not see a back arrow at the top of the iOS app on the “Add New Tablo” screen, just a refresh icon in the top right.
I’ve uninstalled the Tablo app, rebooted the iPad, re-installed the Tablo app. I’ve also uninstalled and re-installed the Tablo app (without reboot) several times. Lastly, I power cycled the Tablo. None of these steps resolved the issue.
I’m connecting to the same Tablo just fine with multiple Rokus, the Android mobile app, a web browser on a PC, and the iOS iPhone app (same iOS v9.3.1.)
(Similar thread: Registration Error)