PlatformUnavailable errors can have many causes, here are a few of the most common.

• Steam is undergoing maintenance
  • You can check if Steam is experiencing downtime here: Steam Down Detector
  • In this case, please wait until Steam’s maintenance concludes

• Stormgate is down or undergoing maintenance
  • While usually you will see a NoPermission error if Stormgate is undergoing maintenance, periodically you might instead see PlatformUnavailable
  • This is simply because we are doing work to resolve an issue or service, and we should be back up shortly
  • For updates on maintenance or unexpected issues please check the official Stormgate social channels

• Client / Server mismatch
  • PlatformUnavailable errors often happen following a new client patch, and you will see the error if you attempt to log in using a version of Stormgate that is no longer compatible with our servers.
  • To correct this, you can either wait a few minutes for your Stormgate to begin its latest update, or you can manually verify the integrity of your game files to get it to update right away
• General Connection Troubles: 
  
  • Check our connectivity troubleshooting guide here: https://support.playstormgate.com/hc/en-us/articles/27655168753051-I-am-having-connection-problems