I see this solution: Unbound starts failing when I set pi.hole to use it? - #3 by Norlig
However, within /etc/resolvconf.conf
unbound_conf=/etc/unbound/unbound.conf.d/resolvconf_resolvers.conf does not exist.
The final line within my file is: unbound_conf=/var/cache/unbound/resolvconf_resolvers.conf
I commented that out and removed the file, but it did not fix the issue.