I have an Experia Box 12. The subscription (as per an email received and an invoice) is active. Following the installation instructions given, the internet dot does not stop blinking (we have even kept it on for an hour to see if it was a time issue).
Furthermore, we have even followed the instructions given to fix it: turning it off and on again, checking the cables and even doing a factory resetting with a little pin.
At this point, I have no clue what could be done to fix the issue.