The city of Detroit keeps sending a bill for taxes due but the W2 is done by my employer and shows the amount withheld for the city. Now’s it almost with collections.

TurboTax only prepares a few city or local tax returns as an extra step in your state return.  For most local tax returns you are on your own.  You may have to ask around amongst your neighbors, etc. to find out if you have a local tax and how to pay it. “Google “ local tax for your area.  Call your city government, etc.  Your only record of paying your local tax will be your own bank/credit card records

https://ttlc.intuit.com/questions/1899325-which-city-tax-returns-can-i-do-in-the-turbotax-state-program

If you had city withholding, that is just one step.  You need to file a city tax return that puts on paper whatever they require (your income, and deductions, etc.) and calculates the tax owed.  If the tax owed is more than you paid in, you owe an additional payment.  If the tax owed is less than your withholding you would get a refund.  But it's not automatic, you have to officially file it and put it down in writing. The city doesn't have to give you credit for the withholding until you show your work on the form.

Turbotax does not prepare most city taxes.  (Only New York City and a few in Ohio, I think).

The form is pretty simple and most of the information will be copied directly from your federal or state tax return.  Fill it out, and mail it in with a check or claim your refund.

https://www.michigan.gov/taxes/citytax/detroit/forms