Hello @ll,
currently it is not possible (or I am not aware of the correct method) to get an AI aircraft back under "ATC control" when it has been created the wrong way as Non-ATC aircraft.
It would be very helpful if a method could be provided to get them back under ATC control in that state, for example by sending them a flight plan.
Many thanks for your consideration and best regards
Oliver Binder
Lorby-SI