I've never heard of network programs being blocked from being recorded. It sounds like the individual at Cox you spoke with was misinformed or you misunderstood what they told you.
There are reasons why scheduled recordings may have failed. An episode could have been pre-empted by other network programming or the recording could have failed because it conflicted with another higher priority scheduled program.
All season 25 episodes of "The Voice" are available On Demand except the Tuesday hour long episode 4 on March 5. You can watch all but one hour of season 25 On demand for free.
I don't watch "Abbott Elementary", but all season 3 episodes broadcast so far (1-10) are available On Demand. You didn't have to pay for Peacock to watch missed episodes of either program unless you really want to see that one hour of "The Voice". But, while an episode did air that night, whatever made it unavailable On Demand may have made it unavailable on Peacock too.
Note: All On Demand availability referenced is for Cox TV. If the program episodes aren't available On Demand for Contour users, that would be a different issue.
Another possibility is the missing episodes were recorded but were deleted from the DVR during a nightly update. This is a known issue with some Contour receivers.
