I am attempting to set up a collaboration with a Partner organization. I tried to invite the lead from that organization on our shared project to the project folder.

This generated an error stating: 

'Invitations could not be sent to the following people because collaboration is restricted to their enterprise's Collaboration Allowed List:'  followed by the email address of the person I attempted to invite.

Does this mean I need my collaborator to request access from his organization's BOX administrator, so that he can collaborate?

Many thanks