IPTV not working on MR60

Hi,

I recently purchased a Netgear Nighthawk Mesh Wi-Fi 6 system (MK62) on Amazon, after installing it and setting all my network I just realize the IPTV is not working, the rest of the network worked like a charm, wired and wireless devices like computers, cellphones, etc.

Just to put in context;I had fiber ISP which they provide me a router, but since ISP routers are not the best ones I have connected into a personal router to manage all my network: wired and wireless, previously I had a TP-Link Archer AX50 with Wi-Fi 6 doing that job and the IPTV used to worked fine. But once I connected the MK62 the IP TV is not working.

Here's a little diagram of how my network is set up:

When i had connected the Archer AX50 it was similar, only difference was that instead of the MR60 and the switch it was the Archer AX50.

Any idea, sugestion on what could be blocking IPTV?