It is probably because you used the Free Edition. In order to gain access to your prior year tax returns, you would need to have upgraded to the Free Edition with Plus, Deluxe, Premier, or Self-Employed product. Please see article below:
Are you log into the same account that used for 2010 and 2011? If you are not logged into that same account, then you will not have access to those prior year returns had you sign in using a different account with no prior year access. If you have forgotten your login credentials, please see the TurboTax FAQ on how to recover your account: <a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/1899319-account-recovery-request-for-your-turbotax-account">https://ttlc.intuit.com/questions/1899319-account-recovery-request-for-your-turbotax-account</a>
No offense, but I'm not stupid, it's obvious I have to be logged into the same account.
Since our representatives on the AnswerXchange platform do not have access to customers accounts, then you would need to call our customer support team to further assist you with this issue. Please visit the TurboTax phone page:<a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number">https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number</a>