You have not told us anything to support the idea that the software made a mistake. Why did the IRS say you owed? If they sent a letter that says you owe more what was the reason given?
The accuracy guarantee is for the calculations. If you made a mistake by entering something wrong or left out income, omitted information, or entered something in the wrong place, etc. the accuracy guarantee does not cover user errors.
https://turbotax.intuit.com/corp/guarantees/
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