I had this problem pop up an hour ago. HBOGo took me to that purchase/account page and wouldn't log me in, other apps of mine said I hadn't purchased the cable channel. Thankfully I found this thread.
First guy I talked to was on the cable side of things. He was familiar with the UDB refresh, but said he needed to transfer me to the internet side of things to do that. The guy I got in internet was not familiar with the UDB refresh at first, but looked it up, said it made sense, and got someone to help him do it. It worked...however, give it a minute or so to take effect.
The trickiest part was getting throught the maze of prompts to speak to someone.
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