Few bits of information needed for this issue:
One of our users at our University created their own JSM org (We'll call this university-team.atlassian.net) this org is not related to our license whatsoever but happens to have our University name in the URL
Another one of our users, when trying to set up the mobile app, accidentally joined university-team.atlassian.net thinking it was our University's license of Jira.
Now the user would like to be removed from university-team.atlassian.net but the user that created it, the Admin, is not responding. It's quite possible they abandoned it.
The user has no way of removing themselves and since it's not part of our license our Jira Admins have no way of removing them either.
I would assume Atlassian support could remove the user but the user or myself, not being Jira Admins, cannot open a support case with Atlassian ourselves.
What can we do to have him removed?