This usually happens when the computer cannot find the KMS server on their network. You will receive the error message as

DNS server failure 0x8007232A

Unlike Error 0x8007232B, the KMS server does exist on the network, so the only problem is resolving your network. I would suggest you run the network troubleshooter (Settings > Update & Security > Troubleshooting) to fix issues which is on the PC side. However, if you feel the problem could be because there is a restriction imposed by the admin for your computer, you will have to get in touch with the support team.

Mnay a time Firewall is an issue, and a simple change could resolve this issue.