I have the same issue as you guys since SU 5 released end of July… No answer from Asobo other than default FAQ entries… Steam Cloud deleted, doesn’t help I can only start the sim in steam offline mode or without internet connection but when I re enable it, it directly crashes… Store edition using same MS account works fine but no acces to my old purchases so not a solution. Also I just prefer steam instead of the usually broken MS Store…
https://forums.flightsimulator.com/t/ctd-when-connected-to-the-internet/435828