Hello Alessandro, The error message you are experiencing is because of wrong authentication.
Here <https://stackoverflow.com/questions/47583059/google-app-engine-spring-boot-local-testing-with-data-store-gives-unauthentica?rq=1> you can see a Stack Overflow question where this was answered. -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/53e0b12e-8754-494b-ac57-4332064aab9b%40googlegroups.com.
