Recent report determined the crash was caused by pilot smoking cigarette (supposedly it was allowed in Egyptair), and faulty setting of an oxygen mask (set by maintenance to emergency and emitting oxygen, should have been checked before flight). From what I understand it is a 134-page independent report by French aviation experts, not by Egyptian authorities. Here is a summary:
https://nypost.com/2022/04/27/egypta...irs-cigarette/
I think Italian Corriere Della Sera was the first news outlet reporting, and they have most details. You can Google translate it.
https://www.corriere.it/cronache/22_...5c68e9dd.shtml