if you used turbotax last time, it is holding the 5 -digit PIN for you. sorry I can't tell you the exact sequence to retrieve it.
if you choose PIN over AGI, it may pop up

Most taxpayers don't need an an IP PIN — the IRS only issues them in select cases. More info

If you know you need an IP PIN to file your taxes and you lost your CP01A letter (or never received it), you can:

• Retrieve your IP PIN online at the IRS's Get an IP PIN site; or
• Call the IRS at 1-800-908-4490 to have your IP PIN mailed to you. However, this can take up to 21 days.

We are unable to issue IP PINs and you won't find them on your tax paperwork. You can only get IP PINs from the IRS.

 

I had in mind a 5-digit number that I used to electronically sign my return last year. Where can I find this 5-digit number?

Please see this TurboTax FAQ What is the difference between the five-digit Self-Select PIN I created last year and my Self-Select PIN this year? <a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/replies/5595784">https://ttlc.intuit.com/replies/5595784</a> you will also see a link at the bottom of this TurboTax FAQ on how to find last years AGI. (How do I find last year’s AGI? <a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/replies/3301618">https://ttlc.intuit.com/replies/3301618</a>)