TurboTax is doing exactly what the IRS requires. The IRS requires a 5-digit e-filing PIN as part of the electronic signature if you e-file your tax return. The IRS requires a 6-digit Identity Protection PIN (IP PIN) if the IRS issued an IP PIN to you. They are two different PINs for two different purposes. If you got an IP PIN from the IRS, then the IRS requires you to enter both PINs in order to e-file your tax return.
