I‘ installed sunshine on my PC and Moonlight on my new Steam Deck. For testing I’ve added Cyberounk to Sunshine. When trying to start any of the two default apps or Cyberpunk via moonlight I get this message in the Sunshine log:
[2023:11:30:09:14:12]: Info: Executing: [“I:\SteamLibrary\steamapps\common\Cyberpunk 2077\bin\x64\Cyberpunk2077.exe”] in [“I:\SteamLibrary\steamapps\common\Cyberpunk 2077\bin\x64”] [2023:11:30:09:14:12]: Warning: Couldn’t run [“I:\SteamLibrary\steamapps\common\Cyberpunk 2077\bin\x64\Cyberpunk2077.exe”]: System: Permission denied
I couldn’t find anything on Google about this message. The rest of the contains no error messages. Starting Cyberpunk on my PC is of course no problem.
You might try just launching big picture mode and going from there. It’s not as fast but it works great. Also Steam remote play on the SD sometimes works better than moonlight. Tip if you add a non steam game on your pc you can stream it to.