OpenVPN With Redundant Backend Authentication Servers (Duo MFA)

[snewby]

So I am in the process of adding 2FA authentication to our pfsense OpenVPN servers. I have a working configuration using Duo MFA and their authentication proxy. It works great the issue I have is I haven't been able to get redundancy working in the authentication servers piece. I can add two authentication servers for backend user auth but it will just try the first one and if that one is down it just times out and won't try the other one. Is there a setting in pfsense to make it try the other server? Or maybe there is a timeout period and it's too long? Below is the relevant section in pfsnese.