6 number pin doesn't work

[KatrinaLO]

If you received an IP PIN or CP01A notice from the IRS in the past (or you opted in to the pilot program) you must use your 2018 IP PIN to validate your identity when you file your 2018 return. 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 by following these instructions.

https://ttlc.intuit.com/replies/3302031

You cannot use last year’s IP PIN. The IRS will send you a CP01A notice with your new IP PIN by early January of 2019. That's the one you'll need to file your 2018 return.

If you lost your IP PIN or haven't received one yet, learn how to get one.