Unfortunately, if IRS sent you an IP PIN to use to verify your identity so you can file a return and they will know that you are filing it, not some imposter.
Even by filing a paper return, IRS will delay processing it until they have satisfied their requirements that you are the actual one eligible to use your ssn to file your return.
Here is some additional information about retrieving your IP PIN and explaining the process in examining your paper return if you file without it:
How to retrieve your IP PIN
If you file your return without your IRS assigned IP PIN:
- IRS will reject your electronic return and you won't be able to e-file
- IRS will subject your paper return to additional screenings to validate your identity, delaying any refund you may be due
