The fact that you need to be whitelisted is most likely the cause of this error. The reason you have not been whitelisted yet might be because the beta version of Cloud Tasks API will be released soon and it will be visible in the Cloud Console so there won’t be any whitelisting process anymore. You may have to wait until it is released which should occur within the next week.
-- 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 post to this group, send email to google-appengine@googlegroups.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/cea78c28-7796-4902-a132-be374789d7ef%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
