apple tv doesn't allow code to go in
can't log in to apple tv. code is sent to iPhone, but there is no place on the tv to submit it
Apple TV (2nd generation)
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If you have a legacy model 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.