Aight I kinda solved it, just posting in case someone else is wondering.
In my case I had closed out of GTA 5 via Alt+F4 and there was a half-dead process still chilling in the background.
GTA or the Rockstar launcher somehow messes with the monitor settings meaning while the process is active.
After I restarted my computer I got distracted and started GTA before testing the faf client so a new process was up again.
Closed both and GTA and the Rockstar launcher and the game started like normal.

TL:DR After youve tried everything the first page of google suggest, make sure to also check for unnecessary processes which could mess with monitor/graphic settings.

Aight I kinda solved it, just posting in case someone else is wondering.
In my case I had closed out of GTA 5 via Alt+F4 and there was a half-dead process still chilling in the background.
GTA or the Rockstar launcher somehow messes with the monitor settings meaning while the process is active.
After I restarted my computer I got distracted and started GTA before testing the faf client so a new process was up again.
Closed both and GTA and the Rockstar launcher and the game started like normal.

TL:DR After youve tried everything the first page of google suggest, make sure to also check for unnecessary processes which could mess with monitor/graphic settings.

Appearantly this is the same Java Error as referenced in this post https://forum.faforever.com/topic/1286/faf-error-game-crash

AccessDeniedException looks like you have your .exe setup to be run as an administrator and the fafclient is not running as an administrator so it doesnt have the permission to start the .exe

Try and go into the .exe settings go to compatibility and remove the tick from the "run as administrator" box

Hi guys, today my game is not starting giving me the error "Unable to create Direct3D".
The game was running fine 4 days ago when i played last time and now it wont start without any changes on my pc. (at least to my knowledge)
Im Running Windows 10 64bit and the newest NVidia Gameready driver 461.72

Obviously Ive already been through the 1st page of google but nothing helped.
I tried deleting the games.pref, tried several compatabilty modes, completly reinstalled and multiple other stuff that was suggested but nothing helped.
Starting the game on steam yields the same error

If anyone has any suggestions, Id be happy to try them.

Full error msg in case that helps

java.lang.RuntimeException: Forged Alliance Crashed with exit code 1
	at com.faforever.client.game.GameService.lambda$spawnTerminationListener$45(GameService.java:717)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
	at java.base/java.lang.Thread.run(Thread.java:832)

EDIT: The Log always starts normal loading a bunch of stuff and then crashing with these two lines:

warning: GAL Exception: file : c:\work\rts\main\code\src\libs\gpggal\DeviceD3D9.cpp(189)
         error: unable to create device
warning: GAL Exception: file : c:\work\rts\main\code\src\libs\gpggal\DeviceD3D9.cpp(189)
         error: unable to create device

EDIT 2: After browsing the forum a bit it appears that the Java error is identical for several issues making it quite useless but ill leave it for completion