Cannot connect to named based virtual host in LAN

Hi, I've set up two sites on apache2 named based virtual host on opensuse leap 15.2. It seems they have been set up correctly as I can access them from localhost. However, when I try to access them from another machine on the local network, by entering server name in address bar, they cannot be reached. If I were to enter the static address of the wireless card in the address bar the first site can be reached. I have no experience in this area and do not know how to resolve the problem. The router is hyperoptic ZTE H298N and I have followed the instructions to set up port forwarding on the router. I wonder if anyone could help me. All suggestions would be greatly appreciated.