If the Headless Client is trying to join with the same battleye or player ID as an existing player (or another HC instance), the Steam ticket validation will fail.
Verify your -mod= startup parameter in your .bat or TADST profile.
There are four primary causes for this specific error when dealing with Headless Clients:
The -client flag tells Arma it is a dedicated client. Without it, Steam tries to open the main menu.
If the Headless Client is trying to join with the same battleye or player ID as an existing player (or another HC instance), the Steam ticket validation will fail.
Verify your -mod= startup parameter in your .bat or TADST profile. arma 3 headless client steam authentication failed hot
There are four primary causes for this specific error when dealing with Headless Clients: If the Headless Client is trying to join
The -client flag tells Arma it is a dedicated client. Without it, Steam tries to open the main menu. arma 3 headless client steam authentication failed hot