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this means your account is not set up properly on comcasts end. Can you watch hbo on your computer using the watch tv section of the website? Are you signing in with the primary users credentials?
I am having the same issue.
I have HBO and I can watch HBO shows on XfinityTV but I would like to use HBOGo as the XfinityTV Flash video player has the worst buffering capabilities I have seen since 2003.
I called Comcast and explained that I was unable to access HBO Go or similar sites even though I have a payed subscription to HBO through my Blast Plus plan. After bouncing me to two other departments, I spoke with a representative that seemed to know what the problem was. He stated that the issue is that I don't have On Demand turned on yet. I don't know if this is the true issue or of it was just another "I'll tell you some BS while I fix the simple little problem." Regardless, he stated that he had activated the On Demand (with no extra charge) and that it should be fully accessible within 24 hours. He also gave me a number to call if I still have issues with the "HBO on the go" as he called it.
Crossing my fingers and hoping this works by tomorrow.
After a little under two days of failed access attempts on HBO Go, I decided to try accessing it through the iOS app this morning. I selected Xfinity in the registration section and it created my account and gave me access. I checked later on my computer and can confirm that I now have access to HBO Go!
Though I'm not sure of the details to the fix that the rep I spoke to performed, I am now a fully registered member of HBO Go.
If you are struggling with this issue and have had no luck, give the support number a call, but be sure to put some time into it until they are aware of the issue you are having and can send you to the right department.
I just watched Game of Thrones on HBOGO last night, but I can't login today. I get the same error as the OP. I double checked my access via Xfinity and its all green. I'm guessing its a login issue either with Comcast or HBO.