1. Packages->Order Forms->Add->Type->Client Registration.
1b. https://domain.com/clienturi/login/reset/
2. Support->Departments->Whichever department->edit-> untick Allow only clients to open or reply to tickets
I'm adding Tyson's solution to this thread in case it comes up for anyone else. Nobody should do this unless they rely on snake_case and are having the same issue as @barryf CamelCase should be used going forward.