Use my own domain with outlook.com

I'm trying to use my own domain with outlook.com, I went to Windows Live Admin Center, then click "get started", entered my own domain and then click the next, it gives me the following error message"This domain name can't be used because it contains a protected word or inappropriate language. Please contact support if you feel this is not the case."

If I click the support, it will tell me sign in error.

the interesting thing is no matter what domain I entered, it gives me the above error message.

is it still open to the public? if I want to get support, where should I go to?

Thanks

JH