I created a domain name= Stylesbrough.ng and has been verified using CNAME verification, i tried creating another user under it but am getting the following error.

what can i do to resolve it and the user has a super administrator access user id is = 647771405, as i need to create the user urgently 

This user is not allowed to add in Zoho. Please contact support-as@zohocorp.com for further details