Guys, I asked this question in my own thread as well but just in case some router expert missed out my original thread. Below is the question.

I tried to configure TP-Link Deco M4 as router mode by putting in PPPoE and enabled VLAN with TM Unifi. The WiFi works but the LAN port will not work. I tried plugging in straight to 2 different Computers and a Tp-Link gigabit network switch.

I called TM and they told me to use custom VLAN by disabling IPTV VLAN. However, the LAN port will only work for my computer. It will not work for my Printer (only support LAN Cable, no wifi) and TP-Link gigabit network switch.

Is there anyone encountered this issue before?

What I want to achieve is like this:
Modem -> Tp-Link Deco M4 (primary) -> Network Switch -> Tp-Link Deco M4 (Slave)