I figured this all out, mostly because it's the second year in a row I forgot to set the PIN before filing, so had to set it and refile. It's not in the normal flow so it's easy to miss. It would be nice if when importing, TurboTax could import the fact I had a PIN last year, and prompt me for it this year, or maybe just always prompt for it with "I don't have one" as an option.
