A lot of people have fixed it since then, you guys that are still having trouble, may also want to follow this gentleman's advice. Message 10 seems to have gotten it down to a science.
This is frustrating but all you have to do is activate your verizon fios account at http://activate.verizon.net Most/all of you have probably had verizon in the past and switched to another company and you may be still using you old account username and information. so HBOgo says you are not subscribed. Just activate your account and use your new username that they give you