You are correct that you should not have a penalty if your Estimated Taxes Paid and Withholding are 90% of your tax due.
Make sure your Estimated Payments and Withholding are correct, and go through the interview to see if you qualify for an exception to the penalty.
However, since we can't see your return in this forum, and this is not a known issue in TurboTax, click this link for more discussion on Underpayment Penalties that may help you.
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