Cannot access HBO Go

Hi - I can’t access my HBO Go after keeping my username and switching my account numbers. I’ve called and talked to many many xfinity support and nobody can help me.

My package has HBO and xfinity has confirmed this, but when I log into HBOgo it keeps telling me that I don’t have HBO!!!!!! Can someone please help?!!!!???? Why can’t I use HBO Go when I’m paying for it!!!!!!