I've been having problem connecting to my servers newly protected by Cisco Duo Multi Factor Authentication with WinSCP 6.1. After finishing the primary authentication, I would like to use my security key (YubiKey) to complete the second one. Normally what I do for second authentication on simple PuTTY SSH connection is to enter an OTP passcode directly in the authentication interface by touching the key. But it seems it isn't possible to provide additional passcode during WinSCP connection. After finishing the primary authentication, I receive an auto push notification on my smartphone but some of our users have a YubiKey only.
Any advice would be deeply appreciated.