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[ITDreamFly]

Searching for the error code 0xc0000409 showed this:

Crash on initial loading screen (Works Offline, but not Online)

hmmm… the error combination " 0xc0000409 & ucrtbase.dll " is normaly the missing lang pack “US”. The FAQ recommend a re-install: https://flightsimulator.zendesk.com/hc/en-us/articles/360015893879-Crashing-CTDs-issues But here is a thread where it was seemingly caused by security software like Bull Guard ( which often cause trouble ):

or this

Crashes to desktop on loading

I recently signed up to xbox live and was over the moon when FS appeared on the gamepass list. So installed it and it gets to the loading screen showing the city scape, starts playing music and then crashes to desktop. My spec is Ryzen 5900x Evga 3080 FTW 64Gb Ram Predator X35 (HDR is enabled in windows ) Windows 10 This is a new build machine with the latest drivers for everything installed. The only thing I found odd was during install, the install size is 159GB, yet it only seems to …

Searching the forum for the error code may bring even more possible solutions.

Are you by any chance using an xbox name or windows language that uses special characters like e.g. Chinese?