Domain name can’t be use

Hi there

I just learned how to set up domain email though outlook. I purchased a domain last year, it called www.trustycpa.com. when I typed the domain name in the box to setup an domain email. there is message pop 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".

please advice how can I get a domain email in this case.

Best

Heidi Liu