Are you trying the command on desktop mode or gaming mode? The command no longer works for gaming mode. Something on steams end caused that issue. I would try on Desktop mode and see if that resolves your issue.
Is this on Steamdeck or Windows?
Where you add the aurora.exe in steam tinker launch is where you would add the standalone exe. I haven't gotten a standalone to work for me but other users have said they have. So its really hit or miss and its up to you to see if they work or not.
As always, if you provide the game name and if I own it I would test it and let you know if i can run it.
[Edited by Jaz10, 10/19/2023 7:06:36 PM]