You may want to contact the IRS for clarification. You can reach them by phone or visit an office in person.
IRS Phone Number: 1-800-829-1040. Click this link Taxpayer Assistance Center Office Locator to find an IRS office near you.
Click the TurboTax FAQ below for an explanation of the various types of IRS letters. Click "See entire answer" for the full page view.
https://ttlc.intuit.com/replies/5773622
