Publish OpenVPN routes via FRR/OSPF

[MattB765]

I have a network that looks a little bit like this. Essentially an incoming VPN tunnel could be established on any one of multiple back-end pfSenses (pfSense-a/b). The Fortigate and pfSense's are not directly connected on their interfaces, but share a common VLAN across a switch.

I'd like these pfSenses to advertise the internal OpenVPN routes to a FortiGate using OSVPv2.

How do I specify that 172.16.0.0/16 routes are to be advertised in OSPF? There seems to be only Services \ FRR \ OSPF \ OSPF but the OSPF Networks section in there has DEPRECATED plastered all over it. It directs me to use areas & interfaces. I've added the ovpns1 interface but don't see the OpenVPN internal routes in the routing table.

If anyone can give me some pointers, that'd be well appreciated - thanks.