Access to VPN client

Hello All

As my first topic I would ask a question regarding this scenario

I have a Mikrotik, configured as VPN server.

I have a client that connects the network behind Mikrotik and all is accessible .

My Q is - when I try to connect remotely to the client’s PC / which is connecting though the VPN / I am not able to browse it or ping it..

Any suggestion or way to allow that?

Thanks