I have this problem from my app that uses federated login. When I try enable datastore admin it says
Error: Not Found The requested URL /_ah/login_required?continue=http://ah-builtin-python-bundle-dot-latest-dot-<app-ip>.appspot.com/_ah/datastore_admin/was not found on this server. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/AtBeeB6mpxkJ. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.