Comment by ipdashc

I got a similar one!

    Issue : Business Rule IND-031-04 - `PrimaryPriorYearPIN` or `PrimaryPriorYearAGIAmt` in the Return Header must match the e-File database. If you are unable to provide a valid `PrimaryPriorYearPIN` or `PrimaryPriorYearAGIAmt`, then you may instead provide an Identity Protection PIN (IP PIN) to electronically file your return. An IP PIN may not be used if you are filing Form 9465 standalone. If you wish to get an IP PIN and you don`t already have an account on IRS.gov, then you must register to validate your identity. Please visit www.irs.gov/getanippin for further information and resubmit your return.

    The following information may help you determine the form at issue:
    Field/Xpath: /efile:Return/efile:ReturnHeader/efile:Filer/efile:PrimarySSN

Got a bit of a kick out of it. Feels weird to see inside the "implementation layer" of sorts for the IRS, of all things.