jessamyn, Helped a friend get an Apple TV+ subscription up and running on her ancient (3rd gen) Apple TV. The machine is too old to have a mechanism for accepting 2FA verification codes and she was stuck in an authentication loop.
The Apple solution: when the device asks, again, for your Apple ID password, enter the password and append the six-digit code. So like if your password is "rabbits" you'll write rabbits123456. This actually works and is so smart and also so dumb I always forget about it.
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