You need the account and user ID in order to access a tax return that was prepared using TurboTax online; or if he used desktop download software, the tax files are stored only on the computer that was used to prepare the return.
If you were still married in 2023, you can seek a copy of the return from the IRS:
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
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**