Microsoft.Identity.Client.Instance.Discovery.CloudMetadataKeyNames
Well-known keys for the cloud-specific metadata returned by
GetByAuthorityHost.
The cloud-specific FIC (Federated Identity Credential) token-exchange audience URI, stored
without the /.default suffix (e.g., "api://AzureADTokenExchange"). Use
FromAudience to obtain the scope form (with
/.default) for client-credentials flows.