Thanks for reporting this. It seems you are trying to use Application Default Credentials to set the default service account to authenticate between services. To clarify be default GCE service accounts have the Cloud IAM project editor role <https://cloud.google.com/compute/docs/access/service-accounts#default_service_account> so please check if that is still the cause or if it has been modified. I can see you are using Compute Engine credentials which is recommended to explicitly state the credentials being used. In terms of Blogger API, it doesn't appear to be directly supported by GCP but if the issue is with the API then this Blogger Community forum <https://support.google.com/blogger/community/?hl=en&gpf=%23!forum%2Fblogger>can be used to discuss authorization for the API.
-- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/0ee54da1-095f-4ad8-87cd-48abaf877287%40googlegroups.com.
