If you receive the message:

<<Failed to Join Party.>>

BadBuild

You and a party member are playing incompatible game versions.

To resolve;

Exit your game and completely close Steam. Once you restart Steam, you should receive a message to update the game.

To completely close Steam:

  • Go to your Windows taskbar
  • Click the “^” icon
  • Locate and right-click on the Steam icon
  • Select “Exit Steam”
  • Then restart Steam

Or you can close Steam in the Task Manager

  • Click Alt+CTRL+DEL
  • Select Task Manager
  • Choose Processes
  • Then locate and right-click on Steam
  • Select “End task”
  • Close the Task Manager and restart Steam

If you are still experiencing the issue after following these steps, please contact Customer Support for more assistance.