When trying to shut the engine off in neutral , do you have the park brake set ?
The Dakotas & P/Us, with the electronic T/Case shift that I dealt with before I retired ( 2007) , had to have the brake set before you could select neutral and have the controller respond to the command. Could be that carries over to the ignition on the push button start equipped vehicles.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.