The Sims 4 does not launch on macOS Apple Silicon – silent exit, no error
12. Ensured EA App and The Sims 4 have required file access
Can you confirm the access the game has please.
13. Ensured iCloud-stored game data is fully available locally (Keep Downloaded)
This isn't always enough. Have you tested with iCloud Drive syncing disabled? If you don't want to do that then create a new user account on your Mac with no Apple ID and iCloud sign in and launch the game in that account. Do not copy any of your user data over.
14. Removed quarantine attributes using xattr -cr
No need to ever do this.
Please confirm whether this is a known issue with The Sims 4 on macOS 26.x (Apple Silicon), advise if there is a workaround or fix in progress, and escalate this as a compatibility issue if needed.
No, it is not a known issue and sounds like an issue locally for you. Your description sounds like the typical permission issues users report, whether that is because the game does not have the access it requires or antivirus or EPP software is blocking it, or maybe EA App is failing to confirm your entitlement to the game. Try the clean user account with nothing running in the background apart from macOS processes.
