Why the TNAS device can’t get an internet IP, and no way to download any app’s in the Application Center?

Please check if you are using the router from Vodafone Station. If yes, please refer to the links below to fix the problem.
https://www.artifex.it/informatica/vodafone-station-2-e-server-linux-senza-gui-sblocco-del-reindirizzamento-iniziale-delle-pagine-web/
http://vodafone.station/?page=dashboard_wizard.html&org_url=http%3a%2f%2fwww%2egoogle%2ecom&intercept_id=5&host_mac=6c:bf:b5:00:14:39