It looks like you should have access to both of your sites now, could you please try again?
Discussion
Yes, I have both sites now. I changed the name of the “old” one to open the namespace, but I still have “domain already taken” when I try to change the “45” one. I’ll try again in a few minutes 
I’ve changed it back for now, I didn’t have trouble getting the namespace back in the site that originally had it