Still Private DNS not working

[moon-web28]

I'm using Pi-Hole v5.11.4 and installed using the below command in my ubuntu machine but still Private DNS not working

sudo wget https://raw.githubusercontent.com/GhostlyCrowd/pi-hole-android-private-dns/main/pi-hole5.sh
sudo bash pi-hole5.sh {domain_name} {email_for_letsencrypt}

Can you please tell me how I can debug it?
netstat -tulpn | grep LISTEN result

[varunsridharan]

https://blog.svarun.dev/configure-pi-hole-with-dns-over-tls-private-dns

VS Writings

Configure Pi-Hole With DNS over TLS - [ Private DNS ]

When Google officially launched Android 9 Pie, which includes a slew of new features around digital well-being, security, and privacy. If you’ve poked around the network settings on your phone, you may have noticed a new settings called Private DNS ...

[moon-web28]

@varunsridharan I Already did all the steps, still not working, when I add my domain in Private DNS it's throws Couldn't Connect error and the internet is stop working