PPTP VPN behind Mikrotik

Hi,

I’m having difficulties setting up PPTP VPN in my network:

ISP Router configured in bridge mode>Mikrotik RB951G>Mikrotik RB951G.

I would like use the second RB951G as a PPTP server.

DHCP, NAT, PPPoE client and port forwarding is done on the first Mikrotik router.
On the second Mikrotik I enabled PPTP Server, created the VPN pool 10.1.1.0/24.

I forwarded port TCP 1723 on the first Mikrotik pointing to the second Mikrotik.

Users can successfully connect through PPTP VPN but NAT and network discovery is not working for the VPN users.