Without seeing your return or the letter, we cannot provide definite guidance. Here is the link for the TurboTax audit support center. Even if you didn't purchase Audit Defense, this may help.
Additionally, I would recommend calling the number on your notice and asking for more information on how they reached that determination. It's a good idea to have the return in question printed up or on your computer when you call in case you need to refer to it.
@looneylui
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