I am having the same issue.
You did not address/nor answer the questions asked.
1) Can I? or why can't I? Re-file the amended return with the proper signature.
When trying to resubmit I get this message at the end : "Duplicate Social Security Number: A tax return with the same Social Security number has already been submitted - in other words, it
appears you're trying to e-file the same return twice. If you need to change this return, you'll need
to file an amended return on paper, by mail."
2) "Do I need to download MI-8453 ...... mail it in"? Yes or No?
3) Do I need to send all my Michigan tax forms by mail.? or just the M-8453?
