Hello Evan, Running your gcloud command without the --sources part results in successfully getting the application default credentials on 2 different freshly-created instances. Does the error manifest itself in special circumstances? Are there any other details needed to correctly reproduce the error?
-- 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/0063a989-74ff-4a06-8cf7-c2447fe90552%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.