This domain can’t be used because it contains a protected word or inappropriate language.

Hello I am still unable to register my domain www.acumaven.com on the windows live admin centre to use custom domains with outlook.com. I received an email from Lanie informing me that the custom domain www.acumaven.com has been added to the white list. I tried registering again and I still get the same message - This domain can't be used because it contains a protected word or inappropriate language. I gave it a day and tried again and still up to a few minutes ago, its still the same message.