Can I use Google 2FA, Yubikey , DUO simultaneously?

Google 2FA, Yubikey and DUO can be configured and set for use simultaneously in the web panel.  The ssh jumphost user can set the all the three 2FA and can use any of it to authenticate depending on the users choice.

If the User has forgotten to take his Yubikey device, then he can authenticate with the Google 2FA or DUO Security app installed on his phone and vice versa.