I was using DSR through the control panel to render as 4k. Here's my dxdiag post:
@Izaka Please reset DSR to 1x (the default), restart your computer, reenable your preferred setting, and test. If that doesn't help, go into Documents\Electronic Arts\The Sims 4, move options.ini to the desktop, and see whether you can enable 4k in the graphics options. The game will spawn a new options.ini with default settings, so if this doesn't make a difference and you don't want to redo all your other in-game options, you can delete the new file and restore the old one.
If that doesn't help either, try doing a clean uninstall and reinstall of your graphics driver, as described here:
Download a fresh copy of the newest Nvidia driver:
https://www.nvidia.com/Download/driverResults.aspx/187602/en-us
Restart after installing the driver and before changing any settings. You'll need to redo all your Control Panel settings; please change only the DSR setting and then test.
I've done everything you told me and yet my game still wont launch in 3840x2160. Is there anything else I might be ablo to do to fix this error with my game?
@Izaka I asked someone else to test this (thanks @JonaO703 ) and he could switch to 4k, but only with the game in fullscreen mode. He also said the game window keeps minimizing, so there may be something off about this process on the Sims 4 end.
Anyway, please try fullscreen mode and let me know how it goes. You may want to make a backup copy of the options.ini file first so you can restore it if you have the same issue. It's also possible to edit options.ini after the fact if it comes to that.
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