This is the exact same problem I'm having. I just signed up for Comcast service yesterday and was told that once I have a username/password, I'd be able to access My Account and the "pre-installation" perks like XStream (I'm waiting for full installation). It looks like I'm logged it, it's just that I can't access anything without these error messages:
"We are having some trouble connecting"
Or it'll say: "Sorry A communication error has occurred. We have been notified and are looking into the issue. Please try reloading the page or coming back later. Reload"
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