Solution
It is possible that your school's network restricts communication over certain ports as part of its security policies, which can interfere with the product activation process. To determine whether this is the cause, please try activating the product from a personal computer connected to a non-school network.
If access to an alternative network is not available, you may be able to use a mobile phone hotspot as a temporary workaround. Once connected through the hotspot, attempt the activation again. After the products have been successfully activated, you can reconnect to your school's network.