This is a nice solution and glad to hear others have gotten it working.
Sadly I’m stuck at step 6 
My Player Controller has a SpawnCharacter method which gets the Game Mode, casts it to my Game Mode and then tells calls a method in that to spawn my character.
A reference to the spawned actor is returned to my player control and added to an array of pawn references.
At some point I select one of the pawns in the array, cast it to my character class and get the AIController.
At this point the controller seems to be ‘none’.
I believe I followed your steps configuring the settings until this point.
I’m sorry, this is pretty vague but I’m not sure what other info I could give.