How would anyone here other than you know who your field sup is if you’re an investigator? C’mon.
I already answered your second question. If you haven’t done your interview yet just tell your investigator.
Beyond that ask your employer who all needs to be notified. If you have a FSO maybe tell him/her too. Your questions can be better answered by someone that you work with than random strangers on the internet that have no clue what you do or where you work.