I can’t sign up for live mail as I get a error msg saying "domain name can’t be used because it contains a protected word …"

I am trying to sign up live mail for the following domain:
NZBASSOCIATES.COM

This is not for spamming purposes, and is for a legitimate business site. I got this error message as soon as i tried signing up:

"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."

Could you please advise regarding the same. This is my first experience with live mail for domains.

thanks in advance!
krayker