You could try adding Steamdeck=1 %command% to the game's launch arguments.
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This. A lot of game devs see fit to make games work on Steam Deck but explicitly barr them from any other distro. This command just yes "hi, I'm a Steam Deck!"
It depends entirely on the game and yes some games work with EAC on Steamdeck but not on Linux desktop...for some reason.
Ironsight on Steam (before it shut down) didn't work on Linux for the longest time, The devs eventually enabled EAC through proton for about a year before making it Steamdeck only during the final months the servers were online.
And even using Steamdeck=1 in the launch commands didn't fix that game for me. >.>
Have you tried verifying file integrity to make sure everything is actually installed? Either that or switching proton versions
In steam search easy anticheat and install it.
Did you install it using Steam?
What ended up working for me (for Armored Core 6) was moving the install to my main/OS drive and changing proton version.
Verifying game files usually re-runs the first install script for the game, reinstalling EAC among other things.
Not EAC specifically, but back when it launched, Helldivers2 had some issues with its anticheat, running verify fixed it