Any chance you e tried to put it in neutral and it fires? I had a similar issue and randomly still do, but it fires every time in neutral.Experiencing the same issue. Turn the key and accessory mode works fine, radio plays, ventilation starts, all power items work. But the ignition does not crank. It takes multiple attempts before it will crank and start. Sometimes third or fourth try, sometimes the 20th.
Did you resolve this issue? If so, what was the problem and the fix?