If you received an IP PIN from the IRS, you will need it to e-file. The IP PIN (Identity Protection PIN) which is a 6-digit number that the IRS provides to taxpayers to validate their identity. If you are required to use an IP PIN to file your taxes, they won't get accepted if you don't have it. You will have to mail your return.
Refer to the following TurboTax Help articles What's an IP PIN? Do I need one? and How do I get my 6-digit IP PIN?
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