TurboTax Notification of Error in Iowa State Income Tax

I recently received a letter from TurboTax stating that I had to amend my Iowa state tax return due to an error in how their software handles tax exempt interest. It provided a phone number to call to walk through what needed to be changed. I called TurboTax at that number and they said that they had no record of this issue or any letters being sent. Did anyone else receive a similar letter?

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