Some believe this is directly to a Steam client update which broke EAC and was reverted. My own experience is that the error relates to the “Official Realm”. I am able to get on the “Modded Realm” with no issues BUT on the “Official Realm” the error occurs. Note: Have validated files (no errors), …

Steam - Backend Rejected The Challenge Response

Fatshark_Hedge October 8, 2021, 10:35am 2

Topic		Replies	Views
Fatal Error/Easy AntiCheat Error Technical Support acknowledged	13	1485	October 16, 2021
Official Realm doesnt run, but modded Technical Support acknowledged	2	744	March 30, 2021
Backend reject the challenge response Technical Support acknowledged	3	1102	October 15, 2021
Game dont start in official realm, only open in modded realm Technical Support acknowledged	3	417	September 20, 2018
Easy Anti-Cheat won't start. Game starts without EAC Technical Support acknowledged	24	4037	March 15, 2021