I am new to this Chromecast with Google TV and I have a hard time entering all my passwords with the little remote. I read you can use the Google TV App on your phone to use as a remote, well I downloaded the app and connected it to my Chromecast and it works for things like swiping and clicking etc.. But the keyboard does not work. The screen on my phone says to type and I should see the results on my TV but mine does not work, I can control everything else with my phone but the keyboard doesn't work. I have a samsung galaxy 8+ with the stock keyboard, am I doing something wrong?
I had the same trouble with my Shield and restarting the Shield fixed it. You could try that, hope it works for you.