Help with correct IPTV / IGMPproxy config

Hi, I have seemingly simple IPTV setting from my ISP, however I have a problem to make it work in OpenWRT.

This is a stock firmware on TL-WR840N with working IPTV setting.

I want to use my Archer C6 with OpenWRT 19.07.4 instead.

Now I have installed IGMPproxy and tried to configure it from the available info I found but no luck.

WAN connection over PPPoE is working fine, but TVs are blank.

Thank you for your help!

Have you configured Internet access initially?

Yes internet connection is working, as I said over PPPoE.

Have you configured VLAN on OpenWRT router for Internet connection?

No, I haven't, I don't know how to do that in OpenWRT. I guess you are referring to Network > Switch config?

Yes, I see, that in your config for stock firmware there is VLAN 100 for Internet, so it is interesting, how you have managed to configure OpenWRT without VLAN.