@rebeccacj
As I mentioned in your other thread, if you did not purchase the Audit Defense product, you can contact TurboTax free Audit Support Center for help with an IRS letter and how to respond to it, and while you have them on the phone see if they can help you figure out what the problem was with the 2019 return. The phone number for the free TurboTax Audit Support Center is:
800-624-9066
Hours 5AM-5PM Pacific (8AM-8PM Eastern) Mon-Fri (closed Labor Day)
If you get an automated system, when prompted, say "speak to an agent about an IRS Letter".
