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You wrote 

It’s not lost. He is 18 and have never filed taxes, never reported an identify theft, and never applied for a pin. We have no idea why it’s being rejected and asking for one 

It’s not lost.  The IRS says he has one and you do not know the number.

have never filed taxes The IRS says he has and used an IP PIN.

never reported an identify theft  Now you should think it may have happened.