I tried to map a subdomain of my domain name ibd.us.com and it gave me the following error:
Other subdomains of this domain are registered to another user at WordPress.com so you can't use it for your site. Only that user can register other subdomains.
I do own this domain and have set the name servers to point to WP.
Also, I tried to add a Zone Record for the domain .us.com but it asked me to contact support.
Do I need a zone record for this address? If so, could you please add the Zone Record for me?