However one user email address keeps getting added to the Invitation List. I can delete info@divinegraceenterprises.com from the list but when I try to add it again I get a message flash up at the top of the screen which disappears too quickly to read. The user doesn't get added but when I refresh the page the email shows in the invitation list. I then delete it, try again and get the same result. 

Can someone help do I can get this user/email address added? I've tried three different help methods with zoho but have not yet received a reply.

Thanks