where do I enter my verification code on my tv for apple tv

See the following from Two-factor authentication for Apple ID - Apple Support

If you use two-factor authentication with devices running older OS versions—like an Apple TV (2nd or 3rd generation)—you might be asked to add your six-digit verification code to the end of your password when signing in. Get your verification code from a trusted device running iOS 9 and later or OS X El Capitan and later, or have it sent to your trusted phone number. Then type your password followed by the six-digit verification code directly into the password field.

If you have an Apple TV (2nd or 3rd generation) and two-factor authentication for your Apple ID, then you may be asked to type your password followed by the six-digit verification code directly into the password field. Additionally, there is a time limit, after which the code becomes invalid.

Try this: First enter the characters of your password (do not submit yet), then manually request a new verification code, then append that code to the password (no spaces or other separating characters), and then submit. That should help you get passed the time limit.

Do you even have two-factor authentication turned on for your account?

Do you have a reasonably modern iPhone, iPad, iPod touch, or Mac, and using the same Apple ID account?

If not, ask the Apple Support staff for assistance.

If you do, then we should be able to guide you.

This did not work. Any other suggestions?

This did not work. I tried 8 times. Very frustrated!!

Thanks for the suggestion. I was unable to manually request a new verification request. Very frustrating.