For all peoples who still have the error on Google Chrome, please do the following:
IMPORTANT: You may export your bookmarks or sync with your Google account before following any steps below
Uninstall, delete data if asked and reinstall Google C hrome.
Make sure chrome://flags are default
If the setting still remember, click on 3 dots on right corner, scroll way down to the buttom and click reset.
If your profile is not deleted, click on your name besides minimize button, and delete all profiles.
Click on the green "Secure" or the (i) icon beside url and allow flash on this (tv.xfinity.com) website.
Make sure you are not connecting to any VPN, DNS or proxy that could prevent xfinity from streaming.
When i followed these steps, it solved the problem.
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