How to resolve "Request is not tenanted properly" when I try to "Invite users"?

[Paulch Outlook]

When I try to add my first additional agent to my free account by selecting "Invite users", it returns "Request is not tenanted properly" after I entered the email address and submit the request.

[Ellis Morris]

This issue sounds confusing, especially when you’re just trying to add a new user. The message “Request is not tenanted properly” usually means something isn’t set up correctly on the account backend, not that you did anything wrong. It’s a good idea to highlight it, since others may run into the same problem and the service team can clarify what needs to be fixed.