Can't detect any device in my network

Hi everyone.
I think I have some wrong configurations in my network and therefore all the devices (Switches, Sonos speakers, air conditioners etc.) which are not connected via Ethernet cable are not being recognized by the home assistant.
I will be very very glad if someone will help me to solve that.

My setup:
HA configuration:

  1. RPI4
  2. Home Assistant OS 7.2
  3. supervisor-2021.12.2
  4. core-2021.12.10
  5. General configurations: External URL - EMPTY , Internal URL - EMPTY
  6. Network: Auto Configure Detected: eth0 (XXXX,…)

Network setup:

  1. TP-LINK router who being used only as a bridge.
  2. TL-LINK deco M5 is connected directly to the router (and another M5 unit is placed in the house).
  3. The M5 provides two networks:
    3.1 General network who works in both 2.4 and 5GHz
    3.2 Second network for my smart home who works only in 2.4GHz
  4. The router has ports forwarding for 8123 and 443
  5. The router provides static IP for the my home assistant.

Hope I didn’t miss anything.
Thanks for your help.

Do you by any chance have client isolation enabled on your wifi?

I.E can two different devices on wifi reach each other?

Also, do both wired and wireless clients get their IP’s from the same DHCP and use the same gateway?

And the two (three) M5 networks - are they separated by VLAN? If so that might be your culprit.

Put yout TP-Link Deco in Access Point mode.
In the default “Router” mode, it creates its own VLAN.

Just found that I receive ping from all of the devices which connected via cable but not from devices which are connected via WiFi (via the deco)

I did it, doesn’t help
I can get ping response only from wired devices