I receive Game Error: Failed to Contact Key Server when launching a game from Steam.
Upon trying to launch a third-party title on Steam, you may experience this error. The most common causes of this issue are listed below:
While we do our best to anticipate demand from our users, occasionally we may run out of keys to provide for your purchase. When we are out of keys, this error will appear. You will be issued a key as soon as we have been given more by the game's publisher.
Rarely, communication errors with Steam may cause this message. Please check the Troubleshooting Network Issues guide for more help.