BIND 9.16.1: unable to set effective uid to 0: Operation not permitted

[Mike Lewinski]

This error (unable to set effective uid to 0: Operation not permitted) was reported a year ago where it affected BIND 9.14.0: 
https://lists.isc.org/mailman/htdig/bind-users/2019-March/101582.html

I can confirm this error still exists in the most recent isc/bind copr version 9.16.1 installed on CentOS 7 using the reference caching-only resolver configuration from the Bv9ARM.

The process is running with this command line: /opt/isc/isc-bind/root/usr/sbin/named -u named

It is started from the unmodified copr installation of /usr/lib/systemd/system/isc-bind-named.service

[Unit]
After=network.target
Wants=nss-lookup.target
Before=nss-lookup.target

[Service]
Type=forking
EnvironmentFile=-/etc/opt/isc/isc-bind/sysconfig/named
PIDFile=/var/opt/isc/isc-bind/run/named/named.pid
ExecStart=/opt/isc/isc-bind/root/usr/sbin/named -u named $OPTIONS
ExecReload=/bin/kill -HUP $MAINPID
ExecStop=/bin/kill -TERM $MAINPID
PrivateTmp=true

[Install]
WantedBy=multi-user.target

I've been trying to track down a (probably) unrelated dnssec issue resolving theoptimalfinancialgroup.com and this error has distracted me from my investigation.

Mike