Authentication failing on Oculus and Steam VR

Symptoms:

• When trying to access Gaming Services such as Cloud Code or Cloud Save on a VR application an error is being thrown such as; Access token is missing 
  unable to validate token

Cause:

The tokens only last for one hour and the Authentication SDK will automatically renew this as the application is running. When a user takes of a VR headset it will go into standby which can cause this one hour window to be missed so when they resume play the token will no longer be valid.

Resolution:

You can set up a retry mechanism in your code to sign the user back in every 5 minutes to counter this or you can sign the user back in when you receive the error and re-attempt the call the Cloud Services.

try 
{ (do cloud services call) 
} 
catch (CloudSaveException e) 
{ 
  if (e.Message.Contains("Access token is missing") || e.Message.Contains("token expired")) 
  { 
    // Attempt to sign in again 
    await AuthenticationService.Instance.SignInWithSteamAsync
    // Retry your request (do cloud services call) 
  } 
  else 
  {
   throw; // some other error 
  } 
}