| I've configured the tp link as access point through 188.8.131.52|
Assuming you meant 192.........what's the LAN IP of your SOHO router? What is the scope of your DHCP server? Are you able to ping the LAN IP of this device from a computer on the LAN?
Please post the exact IP addressing of the extender (including Gateway, DNS etc) and also do the same from a working computer connected to your network.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.