Problem setting up two Wi-Fi module for two way communication

I have two Wi-Fi modules (Moxa AWK 3131) from MOXA. I am trying to set up these two modules in such a way that they can talk to each other. I have connected them as follows,

I have configured the MOXA1 as AP and MOXA2 as a client and the IP address of to laptop are chosen under the same sub net that is 192.168.127.xxx

I am able to connect these two MOXA modules and I am also able to ping the IP address of Laptop_A from laptop_B (from Client to AP) but what I am not being able to do is ping the IP address of Laptop_B from Laptop_A (from AP to Client).

Why am I not being able to ping from AP to client? Is AP only listening from client ? Is this set up wrong to make a two way communication? If so, what changes do I need to make in order to establish a two way communication between these two MOXA modules?