Issue identified from previous post.
BTW, I experienced service interruption due to late payment previous morning. Payment was made immediately following this discovery. All services were restored within 30 min. After numerous calls into support last night with no Live Stream resolution, I decided to further try to view live TV.
I tried the XFinity Stream app on my tablet and cell phones also. Couldn't watch anything. App replied back indicating subscription is required; occasionally providing error 12012. Yet all channels worked fine on the XFinity cable boxes. This got me to thinking issue is in account profile.
Contacted customer service again and verified account was fully restore with no changes.
Apparently, Xfinity billing system needs to update Xfinity live stream server, and update profiles; as this is an eternal application. This can take up to 48hrs. In my case, 24hrs.
Clearly no one at Comcast knows this nor cares to share this, as this is an further interruption in service caused by their system, entitling a rebate. TODAY, ALL LIVE STREAMS WORK NOW.
From my hours (yes, plural) long conversations with Comcast technical support/customer service/advanced care... (and whatever other name they want to give their departments), my understanding is that when your modem is re-set (I guess if you physically unplug and plug back in, or a service outage happens, or a lightning strike, or a multitude of other reasons), the "bridge mode" can become "enabled." I have no technological background or skills so I cannot explain what this means... but feel free to ask the "Advanced Care" department to check all settings on your account profile and "disable the bridge mode." I hope that works for you. It seems to be the trick on this end.