Cannot resolve NTP server address: Try again on New V6 Setup

General Customizing Pi-hole
1

Getting this error in diagnosis information now:

Error in NTP client:

Cannot resolve NTP server address: Try again

I have pi hole configured to using unbound as the recursive DNS server. I'm a newbie to using Unbound and Pi Hole recursive so I may very well have missed some configuration setup.

I have Quad 9 setup as my WAN on my router instead of my ISP.

Debug Token: https://tricorder.pi-hole.net/jt8nWzD4/

Running Diet Pi v9.11.2 on RPi Model B

Pi Hole: v6.0.6

2

Unbound uses DNSSEC to validate DNS replies, and that may fail if the time wouldn't be correct on your Pi-hole machine.
As a result, DNS lookups would also fail, including the lookup of any NTP server domain.

Please verify whether your Pi-hole machine's time and time zone information is correct.

Resolution would also fail if Pi-hole (or one of its upstreams) would block your configured NTP server domain, or if the upstream would time-out.

Please verify that you don't block your NTP server domain accidentally, e.g. via Tools | Search Lists.

4

I'm not sure how to tell which NTP server domain I am using.

5

Please share the output of

sudo pihole-FTL --config  ntp.sync.server

That line indicates that 9.9.9.9 rather than unbound was used as upstream, and the error doesn't seem related to NTP?