If your Atlassian support team disabled team-managed projects, I'm interested in learning your use case for doing so.
I've disabled their creation - for now at least - on our site. The major reason is when we have boards who's filters involve all projects across our instance, team-managed projects don't get returned in the results. Mainly because team-managed projects can't be returned on a company-managed board.
But tell me why your group has disabled them.
TIA!