I'm guessing this is one of those no-brainers that gets forgotten in Esri software, so often. I've created a custom role for students, and in attempting to invite in bulk using a csv file, of course, AGO doesn't use the Role field, but just makes everyone 'User." I'd call this a bug. It would also be really helpful if you could assign members to a group using the file, too.
So, how about a word on how long it takes you guys to fix this bug? Because, this is such a no-brainer that that is really all you can call it.
So, for now, I guess I need to go in and change 35 g0#&$@($d user types, manually.
Oh, and then add them manually to groups.
FML
Duh.