I added WAN2 and changed OpenVPN to use but getting "route add" errors

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I have a WAN on igb0 that I temporarily disabled. I added a WAN2 that connects to a different provider on igb1. Internet works, things seem to work. However this machine was a peer-to-peer OpenVPN client using the first WAN and when I changed the interface to WAN2 in the OpenVPN client config it doesn't seem to connect anymore, giving the following error repeated many times over:

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ERROR: FreeBSD route add command failed: external program exited with error status: 1
I am not sure how to begin resolving this problem, any advice?