Sims 4 won't launch, game exits with code 100010 (Windows 11 26H2)

Hello,

The Sims 4 stopped launching on my PC. The EA app stays on "Launching game" forever. It worked before.

System: Windows 11 Home 26H2 (build 26300.9974), Intel i5-12450H, Intel UHD, 16 GB RAM. Game installed in C:\Games.

With Process Monitor I see that TS4_x64.exe starts, calls the EA launch helper, and then exits with Exit Status 100010. The call contains the text "DisplayName field missing from registry", but the Sims 4 registry entries (DisplayName, Install Dir, Locale, Product GUID) are all present. No crash in Event Viewer.

Already tried: clean reinstall of the game and the EA app, repair, cleared cache, re-login, new Windows admin account, Avast removed, Defender and Smart App Control not blocking, Intel driver updated, no mods.

Does anyone know what error code 100010 means? Thank you!