VPN Ping - problem

RouterOS Beginner Basics
1

Hello,
I am a new user of Mikrotik Router (HAPac2)

I have a WPS server with a PPTP server to which I can connect without any problem.

The PPTP network has the address: 192.168.9.1

When connecting to the VPN server, devices have the following address:

  1. Server NAS: 192.168.9.2
  2. Mikrotik: 192.168.9.3
  3. Telephone: 192.168.9.4
  4. PC: 192.168.9.4

The thing is that from devices 1,3,4 I can easily browse the network and, for example, get from a PC to a NAS server, similarly from a phone.

I can ping other VPN clients from 1,3,4 devices
However, from device 2 - Mikrotik I cannot ping or browse other PPTP VPN clients

What do I need to add in Firewall to make it work?