How can I access a availability group listener from a non cluster node?

I have set up sql server always on availability group on two sql server VM's in google cloud engine. Basically there is one application server, two sql servers (one at DC and one at DR). All three VM's are in same subnet. I created three VM's in the same default subnet. All three have IP's in same subnet. Basically I created sql server availability group of two sql servers and assigned a availability group listener with a IP in same subnet. I am able to connect to the availability group listener from the sql server node which is part of availability group but I am not able to connect to the availability listener or ping its IP from the application server which is not part of cluster. Basically what am I doing wrong here? The cluster IP is getting assigned to one of the sql server node from where I am able to ping the cluster IP. I am able to ping the sql cluster nodes from application server but not the cluster IP i.e the availability group listener IP.