I've seen others with this same issue when attempting to import from CSV, the error I get is:
"Issue can't be created due to the error/s [ Issue type is a sub-task but parent issue key or id not specified. ]"
I've tried to modify the CSV file to add in fields which others have mentioned, I've put things in those fields just to be sure. I'm NOT attempting to create sub-tasks at all, just import a CSV with some new issues. However, no matter what we try, it is always the same error.
In the past, until recently, this worked using the SAME EXACT CSV, but no longer. Did something change?
What more can I look at to make this function like it once did?