I'm trying to efile an amended 2020 Michigan state-only return, when I click on Efile Now button the efile window shows Michigan Amended Return status "Not Ready" with reason Michigan Return is not completed. I don't have any errors to fix and have checked the efile box on fed info worksheet for Michigan. In the same window the Michigan State-Only option shows "Ready". Do I efile the Michigan State-Only return instead of Michigan Amended Return? I have files attached that need to be sent with the amended return.
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When I go to EF Center, the EF Status shows "Duplicate SSN/EIN". I copied the original file to efile the amended return for Michigan. Can I efile an amended return from the original file AND attach files? When I tried to use the original file to send amended return I couldn't attach any files because the file was already efiled. Could the copied file be the problem? If so, what is the fix to amend and attach files?