Please check the following items, then activate Office:
(1) Check the network connection is working properly. Make sure that your computer must connect to the campus network, or through the VPN (check your IP is 140.119.xxx.xxx).
(2) Check the time zone "(UTC +8:00) Taipei" (from the Control Panel → Clock, Language, and Regional → date and time), if not, please do adjust the time zone, then reboot ;