100D with unifi AP

good night, i have a fortinet 100d

in which I have a vpn with fixed public ip

my production network is the following 192.168.0.X

This network is configured with another office that handles 172.18.1.x

on my wired network 192.168.0.x I don't handle dhcp, all my machines handle it with fixed ip and they have access to the remote subnet 172.18.1.x

I have configured a port in the fortinet for wifi, with the subnet of 192.168.100.X

It gives me access to the local network, but I can not access the VPN wirelessly, I do not know that I need to configure it. i drive an ap unifi pro