DefaultAzureCredential failed to retrieve a token from the included credentials.

Question

I'm trying to use DefaultAzureCredential in a .NET 6 application to access an Azure Key Vault in the following code block:

public static IHostBuilder CreateHostBuilder(
    string[] args) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureAppConfiguration((context, config) =>
            {
                // Build the injected config to get the KeyVaultName
                var builtConfig = config.Build();

                // Add secrets from Key Vault
                config.AddAzureKeyVault(new Uri($"https://{builtConfig["KeyVaultName"]}.vault.azure.net/"), new DefaultAzureCredential());
            })
            .UseSerilog()
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup

Answer 1

VS is notorious for playing up with logged on credentials. I ended up creating a service principal that can access the resources I needed and specyfing its id and password in environmental variables on my dev machine. The variables are:

AZURE_TENANT_ID

AZURE_CLIENT_ID

AZURE_CLIENT_SECRET

DefaultAzureCredential works perfectly fine with them.