google-api-dotnet-client: Vague Authentication failure

I’m getting a vague authentication failure from GetApplicationDefaultAsync().

{“Error reading credential file from location C:\ArtofShell\Google\Vision\GoogleCred.json: Bad Data.\r\n\nPlease check the value of the Environment Variable GOOGLE_APPLICATION_CREDENTIALS”}

Here’s my code:

Environment.SetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS", @"C:\ArtofShell\Google\Vision\GoogleCred.json");
var credential = await GoogleCredential.GetApplicationDefaultAsync();

Repro steps:

1. I created a Service Account
2. I downloaded the credential file
3. I set the environment variable to the path of the credential file
4. Attempted to call GetApplicationDefaultAsync()

Cheers, Trevor Sullivan Microsoft MVP: Cloud & Data Center Management https://trevorsullivan.net https://twitter.com/pcgeek86