Yeah HireRight was unable to verify my most recent "self employment". They returned my info to Apple as all OK/verified except for that. They want ridiculous things like tax statements from a PAID preparer, so if you do your own taxes they will not accept them. I had nothing to give them on their list. This was almost 2 weeks ago now. Nothing from Apple yet... but no rejection letters either. I still am hoping but am starting to give up.
I was in the same boat and I told HireRight to just put "no verifiable employment" since the only way to have any record of freelancing is to file a DBA(doing business as) when you first start a self employment gig. The bottom line is that I had no employment history at all and I still got hired.