@gary1946 You might have to port forward the website's port to the host PC to reach it from Appe devices since the mDNS resolver might not be able to find the site on the NATed address in WSL. This article has some good information in it networking - WSL-2: Which ports are automatically forwarded? - Stack Overflow

  @gary1946 because the Ethernet adapter on your Windows machine is bound to the NAT interface of WSL and ARP requests get dNATed and a response goes back to the client. From WiFi the Access Point is in between and eats the ARP request to the 172.x.x.x address thus no response for the IP over Wi-Fi. You should be able to reach the web site over the 192.x.x.x network though once the port forwarding is set up