As we build out our JSD solution, some of our field agents are opening tickets on behalf of customers. They have internal access already to Jira/JSD and I have added a few to the 'Customers' list. However when I try to add their accounts to the organizations for our individual customers, to share tickets, it says the account name is not a valid email address. I dont want to create new accounts, I just want to add them to a group.