Most likely you initially received that "incomplete" notice because some of your state forms were not yet available for efiling at the time you filed the Federal return.

Most Michigan state forms are now showing as available for efiling, but there are a few that aren't ready. You'll have to look at the FAQ linked below to see if any of your forms are not yet available.

The state return can say "incomplete" if you already efiled the Federal return by itself and it has not yet been accepted, or if some of the state forms were not available when you tried to efile it at the same time as efiling the Federal return. If it says "incomplete", your state return has NOT been efiled. You will have to come back later to file it.

If you mailed the Federal return, then the State return cannot be efiled. It would have to be filed by mail, too.

You can check on the availability of state forms here:
https://ttlc.intuit.com/questions/1908857-state-forms-availability-table-for-turbotax-individual-per...

So once your Federal return has been accepted (if efiled), and once all your state forms are available, you can then go back and open up your State return to complete it. Carefully review it before filing since the forms may have updated since you last worked on it.

NOTE: When you come back to your account to finish and file your return, you may see a notice to finish and file the state return. If so, you can follow that path to see if it gets you back to the state return.

If it doesn't, here's a way to open the state return back up:

Log in and go to the 2016 Tax Timeline.
Scroll to "Some things you can do."
Choose "Add a state." (you're not really adding one; that's just to get the return to open up.)
Once the return is open, you can go to the State Taxes tab to complete the state return. Carefully review it before filing since some of the forms may have updated.
Also step through the Review tab.
When you go through the FILE tab for efiling, make sure you go all the way to the end and click on "Transmit return now."