Couldn't set up IPTV for my friend's openwrt router

He uses Superonline's TV+ IPTV service in Türkiye. I've done it with Tivibu IPTV once, I tried to do the same with it. I assume it would work: Openwrt my working IPTV config(Turktelekom Tivibu, and also Superonline TV+) - #13 by bosukes

What I've tried:
I've tried changing VLAN numbers accordingly, then with mac cloning the actual iptv mac, not cloning the MAC; both didn't work. I don't know what else am I missing.

But nooo, absolutely haram you can't use openwrt!! Funny thing is, another one of my friend was using Freshtomato, as I am also experienced with it I fiddled with his. it easily worked with TV+. Just changed VLAN numbers from my Tivibu IPTV config, it worked. Tivibu VLAN 55 and TV+ was 103.

But not on Openwrt. This must be something simple, but what? Guys, just please give me your example ISP IPTV configurations, this Superonline probably just copy pasting stuff from some other European ISP anyway.

What model router? Is it DSA?

In DSA you need to set up everything (including the existing lan and wan) to use bridge-vlans or it will not set up the hardware properly to switch between the ports.

Asus AX59U.