How do I file for a complete refund of all taxes from Michigan, my CA based company withheld MI taxes for 2023, but I have not lived in or worked in Mi since 2021?

You will have to file a nonresident tax return for MI, which your will prepare first, before your resident state tax return.

For additional information, review the TurboTax Help articles: Do I need to file a nonresident return for an out-of-state employer?, Why would I have to file a nonresident state return? and How do I file a nonresident state return?