According to a previous response by Mr. Mullen, that generally means there’s something your examiner’s did not provide and CivTeam is waiting on that information.
They are very responsive. If you give them a call, typically you can speak to a live person. They can tell you why it is on hold. Sometimes it's something missing, sometimes it's a typo, who knows. They'll tell you.
For me it was a situation where the doctor wrote something that was illegible, and they had to get confirmation from the doctor's office.