I was able to eliminate the error message with a .conf file in access.d by giving it higher precedence in the parsing order than the two files I found there.
dog@freedombox:/etc/security/access.d$ ls -l
total 12
-rw-r--r-- 1 root root 14 Sep 14 13:34 00my_freedombox.conf
-rw-r--r-- 1 root root 11 May 21 04:06 10freedombox-performance.conf
-rw-r--r-- 1 root root 48 Mar 18 18:58 50freedombox.conf
dog@freedombox:/etc/security/access.d$ cat 00my_freedombox.conf
+:daemon:cron