@StlrK
Here's more info:
You can contact TurboTax Support, and they can likely assist you in determining what is causing the "duplicate SSN" error, since I believe it's TurboTax own computers that are recognizing that situation; i.e., I think that's an internal notice from TurboTax. And as such, they may be able to look it up by SSN and help figure out what is causing it and further advise you.
Support Hours are currently 5AM-9PM Pacific (8AM-12 Midnight Eastern) 7 days/week.
FAQ: What is the TurboTax phone number?
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
