TurboTax does not have a copy of the Form SSA-1099. It will have a Social Security Benefits Worksheet which has the tax data you entered for the benefits received.
Go to this SS website for getting a replacement SSA-1099 - https://faq.ssa.gov/en-us/Topic/article/KA-01723
To access your current or prior year tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/
Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show. Click on the Year and Click on Download/print return (PDF)
See this TurboTax support FAQ for accessing prior year online tax returns - https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/01/270...