I just bought an Archer AX23V (listed also as AX1800) in Japan.

https://www.tp-link.com/jp/home-networking/wifi-router/archer-ax23v/

I have updated from a google wifi router.
 

I had no problem setting up the network (PPPoE) and all my devices can connect to the internet with no issues.
Nevertheless I cannot ping the devices inside my local network.

I have not changed any of the default settings aside from reserving the IPs addresses in the DHCP server.

I assume it should be something simple.

Could somebody be so kind to give me some help.

Thanks a lot in advance