Unable to use unbound as upstream DNS server

pi@HornDNS:~ $ sudo pihole -up
[i] Checking for updates...
[i] Pi-hole Core: up to date
[i] Web Interface: up to date
[i] FTL: up to date

[✓] Everything is up to date!

From /var/log/pihole_debug-sanitized.log
*** [ DIAGNOSING ]: Core version
[i] Core: v3.3.1 (How do I update Pi-hole?)
[i] Branch: FTLDNS (https://discourse.pi-hole.net/t/the-pihole-command-with-exa$
[i] Commit: v3.3.1-369-g169a428

*** [ DIAGNOSING ]: Web version
[i] Web: v3.3 (How do I update Pi-hole?)
[i] Branch: master
[i] Commit: v3.3-5-ge1dc4272

*** [ DIAGNOSING ]: FTL version
[✓] FTL: vDev-3e40158 (https://discourse.pi-hole.net/t/how-do-i-update-pi-hole/$