Hi James, 

Welcome to Box Community and glad to assist!

Let me create a new case and a member of our team will be in touch, please keep an eye out.

Thanks for posting!

I have this same problem, can you please open a ticket for me?

I have the same problem. I’ve just tried to add 4 colleagues but 3 of them failed with the message "Email already used in a Box account but not associate with an enterprise”.