Open vpn connected but can't ping remote clients

[kagashe]

Hi guys I've setup a site to site openvpn connection that's connected but I can't ping clients on the remote network from either side. Suspect there's a routing issue but not sure where to start. On one side I also have one other openvpn client connection, not sure if it's messing with it.

[mikee]

What is the default gateway of clients on both sides? Is it the pfsenses?