If your spouse used TurboTax to prepare and file a joint return, then you need the account and user ID that were used to prepare that return. If they used desktop download software, the return is stored only on the hard drive of the computer used to prepare the return; it is not stored online with TT.
Or....get a copy from the IRS if your spouse is not showing you the return for some reason.
https://www.irs.gov/payments/your-online-account
You can get a free transcript from the IRS or for a fee of $30 an actual copy of your tax return.
https://www.irs.gov/individuals/get-transcript
https://www.irs.gov/pub/irs-pdf/f4506.pdf