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.

I've registered a new domain name (fusingbytes.com) for an IT consulting firm, and I'm trying to sign up for the Microsoft Services Custom Domains with it, but I'm getting the 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."