Configuring two uplinks in hAP ac

Hello.

ISP provides two ethernet uplinks into my apartment. One (1) is the internet itself with a static external (real internet) IP assigned by ISP’s DHCP server. The other one (2) is for IPTV. When plugging in a computer directly into IPTV uplink (2), it gets assigned an ISP’s LAN IP of 192.168.0.xxx. And IPTV works via VLC and ISP provided playlist. All the TV channels are available via udp://@239.50.xx.xx:5004 addresses.

Now I would like to have all the ethernet connected devices (TVs, total of three), to be able to access IPTV via some IPTV capable application (most of them on Samsung require UDP-TCP translation though). While Wireless clients don’t need IPTV at all.

Currently, the internet works on all of my devices via uplink (1). IPTV doesn’t work at all inside Mikrotik lan.
Here is the interfaces tab in my WebFig:
Interfaces.png
IPTV port on Ethernet port 5 is disabled and master is set to none.

How can I achieve the IPTV for Ethernet clients? Thank you in advance.