why this routing configuration does not work?

I have 2 VMs in HyperV role:

first is RRAS - it has 2 interfaces (both manually configured, no DHCP):

• 192.168.1.110 - "external" one, connected to the router
• 192.168.10.2 - that's internal interface which other VMs will be using as well

also I added VPN connection to our main server - and it gets 192.168.2.136 IP address in 192.168.2.XXX network. And IP route is create on the server as well for this interface.

second VM is called KITCHENER. It only has 1 interface

• 192.168.10.99 / 255.255.255.0, with default gateway set to RRAS server - 192.168.10.2

QUESTION: how can I ping "main server" - 192.168.2.1 - from the KITCHENER server when RRAS server is connected to VPN? please see screenshots with ipconfig /all, route print and ping 192.168.2.1 commands. What needs to be done to get this working?

all servers are Windows 2008 R2 if that matters. All firewalls are turned off, no antivirus programs are installed - pretty much blank Win2008R2 installs.

this is RRAS server configuration:

tracert from RRAS server to MAIN server:

KITCHENER server configuration