Hope this helps:
After about an hour of trying to log into YouTube on my new Apple TV, I determined that the gmail 2-step verification was the problem.
After entering your user ID forYouTube, you must generate a unique code at Google and enter that I to the password field.
What through me was I didn't get a prompt asking me to do so, similar to the one you get on Exchange setup on the iPhone & iPad.
Hope this saves some aggravation for some.
Good Luck
After about an hour of trying to log into YouTube on my new Apple TV, I determined that the gmail 2-step verification was the problem.
After entering your user ID forYouTube, you must generate a unique code at Google and enter that I to the password field.
What through me was I didn't get a prompt asking me to do so, similar to the one you get on Exchange setup on the iPhone & iPad.
Hope this saves some aggravation for some.
Good Luck