First of all, there was no state in Wrenn as it is a DC case. Additionally DC did not license the activity. That was the whole point of the case, to force DC to grant licenses. IE allow concealed carry.
Actually they did license carry, just did it on a may issue basis.
There was the Palmer case a few years before which did force them to create a license as they had banned carry after Heller. You may be thinking about that case.