The new website and activation system is on a new server because (yay for us!) we outgrew the old one.
Unfortunately the computer names could not be ported over. BUT it's an easy fix!
Download the new (2018.1) build from the View Licenses page and activate your software (here's a handy FAQ on how to activate if you need it). Once you've activated the new software that the computer name will auto-populate into your account.
Note you can also now add a Nickname to the license to help organize and remember where licenses were used.