Cannot E-file Detroit City Taxes

[jfmm]

My wife and I are filing jointly and while we don't live in Detroit and I don't work there, my wife works hybridly for a company in Detroit and therefore gets the city tax held. When I was trying to e-file her city tax return in TurboxTax, the software told me "The Detroit Return for her must be mailed to the Michigan Department of Treasury". Did I do anything wrong? If not why it could not be e-filed? Any suggestion would be appreciated. Thank you.

UPDATES: SOLVED.

[DavidD66]

No, you did not do anything wrong.  TurboTax does not support electronic filing for Detroit City Taxes.  You will have to print and mail the Detroit City Tax Return.