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

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

Hello,

When I tried to add email user to my domain jamescubittresources.co, I got this error:
This user is not allowed to add in Zoho. Please contact support-as@zohocorp.com for further details

Please help.