I tested sending of push notifications to a TV web app and was successful in sending notifications to TV emulators (ver 6.5).
However, after a few sends, I started getting 3008 problem "error of not registered regID". I am sure the regID is right.
I have tried several ways to fix this problem:
(1) register every time the app open
(2) reinstall the app
(3) change the TV emulator
Only (3) was working, although it created the exact same regID, the push notifications started working again. But after some sends, I encountered the same "3008" problem again.