Apple TV - old generation won’t link to home sharing
I see this is an old topic, has this been resolved?
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That is a 2nd gen.
That is related to 2 factor authentication. When signing in on an older model you need to enter the password and code together. However, to stay within the time limit you will need to enter the code then manually request a code and add it to the password
Get a verification code and sign in with two-factor authentication - Apple Support