Sometimes EAC needs to be repaired, please try verifying the integrity of files for the game in your Steam Library. Then reinstall EAC.
Taken from EAC's support site here: https://www.easy.ac/en-us/support/
The Easy Anti-Cheat service is typically installed automatically with each game, and uninstalled automatically when the last game using Easy Anti-Cheat is removed from your system.
You can also install the service manually. To do so navigate to the "EasyAntiCheat" folder inside of the game's installation folder and locate "EasyAntiCheat_Setup.exe". Launch it as administrator and choose 'Install'.
If your Easy Anti-Cheat installation becomes corrupted somehow, you can repair it by following the same steps and choosing 'Repair' at the end.
Easy Anti-Cheat service is uninstalled together with the game. You can also manually remove the service from the system by following the above steps and choosing 'Uninstall' at the end.
Repair missing or corrupted system files: