In this case, I'll post it for others who might run into the same thing.
There are various plugins that resemble each other. Among others, there is check_time and check_ntp_time. I wanted check_ntp_time which should work on most machines that look for an ntp server. The check_time, however, only works when run against an ntp server. (At least by default, haven't really investigated further.)
So, I wanted check_ntp_time--however, in commands.cfg, I'd put check_time.
Sigh.
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