Q.Brugmansia leaves falling off
I recently received my cutting of a variegated brugmansia in the mail. I unpacked it the same day and watered it thoroughly. It is a very healthy looking plant but it started dropping leaves the next day. It is under lights, did not put it out yet. There are no pests on this plant at all. Is this just stress?

This article covers propagation by cutting.
https://www.gardeningknowhow.com/ornamental/trees/brugmansia/tips-for-propagating-brugmansia.htm