I had an issue the other day trying to log in to my youtube account on my apple tv. I couldn’t work out what was going on for a while. My password was correct, account was right. No idea…

Solution

You can only login with you google account now. However it can’t contain the @gmail.com. So make sure you enter just the username part of your email. i.e. [email protected], you would just enter the *firstname.lastname as your YouTube account name.