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?