OpenVPN on multiple interfaces?

[geek]

Is there a way to choose multiple interfaces to run a single openvpn server on? sometimes the primary connection will go down and there's no way for VPN users to get connected. I remember pfsense having this before I migrated to OPNSense

[geek]

I see that there is an option in the interface as "ANY" I assume that's the solution to this?

[geek]

Tried this option, but out of 3 WAN interfaces. It only works on one.

The other two it gets stuck with the following line:
Wed Dec 23 14:28:06 2020 UDP link local (bound): [AF_INET][undef]:0
Wed Dec 23 14:28:06 2020 UDP link remote: [AF_INET]some.ip.here:1194

(firewall rules are exactly the same on all 3 interfaces)

Moreover. If I just set it to a specific interface, it works fine. Just doesn't work in "ANY"

[Gauss23]

One workaround would be to bind it to localhost and add port forwards from WAN interfaces and port to localhost and port.