Using Pi-hole and Tailscale on oracle cloud

hello
i have recently installed pi hole and tailscale for on the go adblocking solution but when i use tailscale to connect to pi hole as exit node. there is no adblocking and dns resolver uses oracle dns.
here is the attached debug
https://tricorder.pi-hole.net/YuUHDfDn/

Let's see if your Pi-hole has processed DNS requests from your Tailscale clients.

Run from your Pi-hole machine, what's the output of:

echo ">stats >quit" | nc localhost 4711
echo ">top-clients (15) >quit" | nc localhost 4711

i have re spun the vps with ubuntu v 20. Now i face no issues. there was some fault in v 24.0