I had a support issue from November related to data sets not showing up on the Open Data site. I tried to post some data last week and the harvest process still has not worked. At this point, it probably will not show up and will remain as a feature service with no datasets.
Here is the bug..
BUG-000082415: New feature services added to an Open Data group takes a very long time to display (sometimes do not display) on an Open Data site, and if they do, they show 0 attributes.
and here is the current status of the bug (updated yesterday)...
Closed: Will Not be Addressed
Well, that's just super! Now what?