Is your 2016 joint return in another account? Are you able to log into it, or not able to log in? If you are able to log in, do you find the 2016 return, but is access to the PDF locked until you pay?
You can discuss your situation by phone with TurboTax Support. I don't know what they will tell you. It might take considerable effort to prove your ID.
Hours are 5AM-5PM Pacific (8AM-8PM Eastern) Monday-Friday.
FAQ: What is the TurboTax phone number?
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
