You may have more than one TurboTax account and don't realize it. In order to access prior years' returns, you need to use the EXACT login (same username and password) that you used when preparing those returns. See the TurboTax FAQ below for possible solutions.
"Why can't I find my return in Tax Home or My Docs?"
https://ttlc.intuit.com/replies/3290682
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
