I'm now able to successfully test MFA using the "Test User Login" feature from the WebADM Control Panel for a user enabled for MFA in my Active Directory, but MFA from ADFS still fails with the following:-
[2016-05-22 20:21:04] [10.0.0.9] [OpenOTP:34EA64FE] > Username:
us...@domain.com[2016-05-22 20:21:04] [10.0.0.9] [OpenOTP:34EA64FE] > Domain:
domain.com[2016-05-22 20:21:04] [10.0.0.9] [OpenOTP:34EA64FE] > Client ID: ADFS
[2016-05-22 20:21:04] [10.0.0.9] [OpenOTP:34EA64FE] > Source IP: 10.0.0.1
[2016-05-22 20:21:04] [10.0.0.9] [OpenOTP:34EA64FE] > Options: -LDAP
[2016-05-22 20:21:04] [10.0.0.9] [OpenOTP:34EA64FE] Registered openotpLogin request
[2016-05-22 20:21:04] [10.0.0.9] [OpenOTP:34EA64FE] Domain '
domain.com' not existing or disabled
[2016-05-22 20:21:04] [10.0.0.9] [OpenOTP:34EA64FE] User invalid or not found
[2016-05-22 20:21:05] [10.0.0.9] [OpenOTP:34EA64FE] Sent failure response