Having issues here as well the error message only states: There is some Network related problem please contact your system administrator.
I have tested on the Corporate network (no control of FW or rules, port access strictly controlled) and on the Dev Network, with the same results.
As there is no mention of the requirements for the Activation to work troubleshooting and making adjustments to the dev firewall could result in wasted effort.
Please advise. Purchased yesterday at 8:00 PM EDT and at 11:40 AM the following day the product is still not useable.