Well, well, well............... this was surprising information.
I called Comcast. The problem wasn't my cable box or boxes................... it was my modem.
The phone person had me unplug the power from it for a 1/2 minute and then plug it back in. He then did whatever he does on his end and then has me try to get my on-demand on my tv.
Apparently...... on demand signalling comes from streaming. Therefore, an online connection was the problem. In the past when I've had issues, it was just a matter of re-booting each cable box.
Way above my scope of understanding, but at least it is now working at this time. Technology is not my forte. Still have a flip phone haha.
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