When did you enable billing? It it's 3 hours ago you might still have to wait a little: it may take up to a day to have the billing enabled.
In the cloud console for your project “UltimateSync”, if you navigate to App Engine → Settings in the left side frame, you’ll notice that your daily limit appears still as “using the free quota”. -- 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 post to this group, send email to [email protected]. 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/35257acc-81f4-4170-962c-892ec54e25a2%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
