Google app business master

I have a domain under [login to view URL] which i signed up couple of years ago I bought another domain [login to view URL] couple of month ago. I want to add [login to view URL] as a secondary domain, so ill be able to use all google docs, calendar in my second organization. I get an error This domain name has already been used as an alias or domain. I need someone to find why i get this error, under wich account it was registered and reset it. Regards, Maoz