TurboTax gets no information from the IRS or your state, so no one at TT knows anything at all about a letter that was sent to you, and no one at TT can find out about it. Sorry.
How do I speak to the IRS internationally?
https://www.irs.gov/help/contact-my-local-office-internationally
**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.**