It's a ridiculous state of things.
So in the beginning there was the Android TV remote app, it worked. It had some weird glitches when using keyboard input and trying to use cursors. but otherwise , it worked.
Then one day Google decided to stop this app from working for no reason. And the alternative they gave us was to use a Google TV app, which remains region-locked . So , basically Google removed the feature of being able to control the Android TV box using your phone.
Months, and I mean months later, Google Home app and Mibox finally update in a way that allows the google home app to control it, and it seems like it's finally good.
But then two weeks later, the feature has disappeared, again.
What's worse is that the feature was never added to my google TV and One of my other miboxes is still working. So it looks like the existence of this feature is completely random. Will you get it to work in your Android/Google TV app? God knows.