"Cannot sync with client X. Headless client has different addon signature."
Run this batch as SYSTEM or a dedicated user with Steam login persistence. arma 3 headless client steam authentication failed hot
Sometimes Steam Auth fails because the HC isn't spawning correctly in the mission environment. Force HC recognition via description.ext . "Cannot sync with client X
Several factors contribute to the Steam authentication failed error in Arma 3 Headless Client: arma 3 headless client steam authentication failed hot