Trevo-all

Hello I have a 2018 L5P and I did an immobilizer relearn on it and now on my dash is a vehicle with a lock on it and it tells me to service theft deterrent system and I was wondering how I go about resetting it myself before I have to bring it to a dealer to have that done. I was told to disconnect both batteries for 15 minutes and that should fix it and if I did that would that be the fix or Is that just a temporary fix?