Please confirm the items below.
Please confirm connection of the internet.
Please confirm internet connection of your computer.
It may need setting of proxy server depending on internet provider. In that case, it may be able to perform activation if set the proxy server.
Please confirm if the time of OS is setting correctly.
On Control Panel- Network and Internet- Internet Option- Detail setting, please confirm if check mark is put on "Use TLS 1.2" If check mark is not put, put it and click "OK" , then restart computer.
The authorization server may be crowded. In that case, wait for a while and perform the operation again.