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

Whenever I try to add ANY user, I get the error:  This user is not allowed to add in Zoho. Please contact support-as@zohocorp.com for further details

My user ID is: 778380865

Hope this can be resolved. 

Thank you