chugpug30 Is it possible your graphics driver's control software uses these keys for something? You wouldn't necessarily see an overlay, although it might be useful to disable the overlay anyway. And regardless, check the key bindings within the software and reassign as necessary.
If that's not the issue, try playing in a clean boot. This isn't a clean install of Windows, just a way to disable background services that might be interfering, in this case capturing the keystrokes. Here's how:
https://support.microsoft.com/en-us/topic/how-to-perform-a-clean-boot-in-windows-da2f9573-6eec-00ad-2f8a-a97a1807f3dd
The one service to leave enabled is the EABackgroundService, which the EA App needs in order to run. Disable the rest as described.
When you reboot your computer, go through the Task Manager's background processes list shutting down any service that doesn't absolutely need to be running, for example anything from MSI Afterburner to RGB software might still be enabled. If you accidentally kill a critical process and it doesn't restart on its own, just reboot your computer again.
Don't open anything other than Sims 4 and the EA App while testing, not even a browser window.
If this helps, you can selectively reenable services until you find the culprit, then either leave that disabled or (if it belongs to an app you want to keep using) let me know what it is so we can try to fix the underlying issue.