I'm not aware of if a crashlog is generated or where it would be located, and so cannot currently supply.
I have been testing this myself to try and fix but no luck so far and wanted to post this in hope that someone may know as I cannot find the same issue and want to document this.
from what i've looked into, if I launch with a single mod, 870MCSSHOTGUN the game would crash. same if I load all selected mods I set up for the game.
as a test I tried downloading a few mods from the steam workshop. example here is the Evac All mod for base game. I noticed I had duplicates so worked perfect as a test. when loading the workshop version, the game would run just fine, whether it be through steam and enabling the mod, or the alternate Xcom 2 mod launcher that seems popular and better than vanilla launcher.
as far as I can tell, the issue seems to be that the mods being stored in the Vortex staging area are somehow causing an issue where the game freezes then crashes immediately on start.
working on it more it's even stranger as other mods don't show up even in the mod loaders, despite being put there in the folder with the others, and even done so manually.