You have to file a MI non resident return to get the MI withholding refunded. Not filing a MI return and letting them keep the money is an option.. TurboTax will charge you $40 to prepare the MI return.
You might want to try filing by hand
https://www.michigan.gov/taxes/-/media/Project/Websites/taxes/Forms/2023/2023-IIT-Forms/MI-1040.pdf?...
https://www.michigan.gov/taxes/-/media/Project/Websites/taxes/Forms/2023/2023-IIT-Forms/Schedule-NR....
