That does not make much sense. How do you know you got a letter from the IRS --and why would it have been sent back? TurboTax knows nothing at all about a letter you would have received from the IRS. The IRS does not share any information or provide any feedback to TurboTax about your tax return after you file and is accepted. You can call the IRS yourself to see what is going on.
To call the IRS:IRS: 800-829-1040 hours 7 AM - 7 PM local time Mon-Fri
Listen to each menu before making the selection.
First choose your language. Press 1 for English.
Then do NOT choose the first choice re: "Refund", or it will send you to an automated phone line.
Instead, press 2 for "personal income tax".
Then press 1 for "form, tax history, or payment".
Then press 3 "for all other questions."
Then press 2 "for all other questions." It should then transfer you to an agent.