I started using Adguard Home last year. Runs on a Mikrotik hAP ax3.

Not even one? Mine, I think most are blocked. I didn't really look in detail but the ads in LYN blocked.

It's a DNS block so you may need to clear your DNS cache. Or just use another device to test.

What blocklist you use?

I’m using these btw. Most of the ad is blocked

did your clients show up on the client list in adguardhome's dashboard?

check browser private dns settings
android private dns settings
icloud private relay

etc

check browser private dns settings
android private dns settings
icloud private relay

etc

support. you want to use the adguard built in dhcp server?

For me, I leave IPv6 dns blank and just use ipv4.

I did this to get ipv6 internet
first you need to obtain the ipv6 address of your adguard home device, then set it as ipv6 dns in your router settings.

Nice   
Glad it is working for you

welcome, sharing is caring. 

Adguard Home, Pi-Hole

These cannot block Facebook, Instagram, Twitter, YouTube ads

Why? Because they can only monitor and handle DNS requests

So, it can see a request to googleadservices.com, and block it
But, these websites like YouTube, the ad comes from the same domain
So, if you want to block it, you'll have to block YouTube.com
Which will block the entire site

So, it's simply not possible for these to block YouTube ads

Use a browser based adblocker, uBlock Origin has always worked for me
Google wants it gone from Chromium browsers, so move to Firefox if needed