Thank you for contacting us. I've checked the subscription, I think the system was thinking there were more users, but I can see that's not true. The last windows account was named differently than the one previously used, so that will be the reason. I've revoked the seats for the first account, so the next activation will get the seat and it will work.
You should be able to see that too in devsense.com account. I will send you an email with the link.