Hello! 

I have set up like that at home ( https://prnt.sc/By9sXyR2xuiw ). The only issue I had was very poor WIFI coverage in the living room and for some reason, I thought I will buy the second AX50, put LAN cable into it in the living room, use LAN2 for IPTV, and will have strong WIFI and IPTV. So I set everything up like that  ( https://prnt.sc/T5GIL955HDDf ), configured 1st and 2nd AX50 with this video https://youtu.be/Cg_gGECGLiY?t=408 (with a second part, manually, disabled DHCP on 1st router, changed IP on second, used LAN ports) and the issue is that IPTV doesn't work. I have set it on the router page like that https://prnt.sc/4we9-jHbU9ef . And if use this config only with 1 AX50 IPTV works, but I set it up the same on 2nd AX50 in the living room the WIFI works, LAN internet ports works, but IPTV doesn't. Maybe it's impossible to make it work with these routers and need a different one? Or should I try to adjust some settings?