Unable to Add Users - Zoho Mail Restriction

Unable to Add Users - Zoho Mail Restriction

I am trying to add new users to my Zoho Mail organization, but I am getting the error:

"This user is not allowed to add."

We are a legitimate business using Zoho Mail for email hosting only. Our company is based in Saudi Arabia, and we may be accessing from different regions.

Kindly review our account and remove any restrictions so we can proceed with adding users.