Based on this doc [1], and my testing, you need to have Project Editor or Project Owner role to run cron jobs from the console.
[1] https://cloud.google.com/appengine/docs/standard/python/config/cron#before_you_begin -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/5a780fbe-d16d-4630-ad7d-7dd642bfe451%40googlegroups.com.
