See if the you can find the notice # in the list provided in this TurboTax FAQ.
https://ttlc.intuit.com/replies/5773622
You can also see the hyperlink to the IRS webpage included in this FAQ. Once you find your notice number, you'll be able to see how to reply.
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
