Having submitted apps to almost every major TV manufacturer on behalf of some prominent global brands, I can tell you there is one common thread through all of this. Outsourced QA.
These electronics manufacturers are devoid of any meaningful software organization internally and almost all of them outsource their app evaluation processes to external organizations. These organizations are paid to find defects and in no way are incentivized to help you get your app into the marketplace. Not only is this incentive structure counterproductive, it also promotes an entirely random and inscrutable process where the same app can be submitted 3 or 4 times with absolutely no changes and receive wildly differing failure reports for completely unrelated reasons because it gets reviewed by 3 or 4 different analysts with different skill sets and random acceptance criteria.
In order to get some apps accepted by Samsung's "QA" process, we literally had to resort to threats in email that if they didn't pass the app, we were going to turn over their completely random QA reports to Samsung and get them fired. Good luck!