please help with this issue, I don't understand why I don't have permission.
Grpc.Core.RpcException: 'Status(StatusCode=PermissionDenied, Detail="Your application has authenticated using end user credentials from the Google Cloud SDK or Google Cloud Shell which are not supported by the texttospeech.googleapis.com. We recommend configuring the billing/quota_project setting in gcloud or using a service account through the auth/impersonate_service_account setting. For more information about service accounts and how to use them in your application, see https://cloud.google.com/docs/authentication/.")'