Can you tell us what won't work?
I had to use a non-OE charger initially, as the NZ dealer was waiting for the H-D OEM cable with a compatible plug to arrive, but their adapted cable worked well for a couple of months and the OBC after that. I just had to make sure the wall socket in the shed had enough juice going to it - after that no issues at all. But, I may have misunderstood what you mean by the OBC.
I had to use a non-OE charger initially, as the NZ dealer was waiting for the H-D OEM cable with a compatible plug to arrive, but their adapted cable worked well for a couple of months and the OBC after that. I just had to make sure the wall socket in the shed had enough juice going to it - after that no issues at all. But, I may have misunderstood what you mean by the OBC.