TurboTax does not receive any information about your return or your refund after you file, so no one at TT knows about your city refund. Did you prepare a Detroit return when you prepared the MI return? If so it would have been part of the process when you prepared the state return--but you would have to take some extra steps while in the state program.
https://ttlc.intuit.com/community/returns-and-forms/help/which-city-tax-returns-can-i-do-in-the-turb...
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