@Cordaromyles6311
Do you mean an IP PIN? These usually aren't required for filing. However, if you received an IP PIN or CP01A notice from the IRS in the past (or you opted into the pilot program) you must use your 2021 IP PIN to validate your identity when you file your 2021 return. If you no longer have access to this, please follow the instructions in the link below on how to obtain your IP PIN.
What is an IP PIN?
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