There are no outright issue pointers in your debug log, but some irregularities, e.g. it wasn't able to determine a default gateway, and it shows pihole-FTL as not running, while it was perfectly able to pass name resolution tests.
What hardware are you running your Pi-hole on?
Would that involve some layer of virtualisation?
I see - you are trying to get Pi-hole running on a smartphone.
We've received a few not very promising reports of attempts to operate Pi-hole on smartphones.
It would seem that OS virtualisation software on Android is not well equipped to host Pi-hole (maybe because it would require elevated rights and full network access, and Android's sandboxing model somehow interferes, but that would just be my guess).
As I recall it, similar reports here on our forum for running Pi-hole under Android have yet to find a successful conclusion.
In some cases, the reports involved a Pi-hole app downloaded from some kind of specialised store or software repository. In case you've been considering that approach: Those apps have not been created or endorsed by the Pi-hole team - the official ways to install Pi-hole on a supported OS can be found here .