If you usually get a two-factor push to your phone, just hit enter after entering your username and password, then complete authentication by approving the push on your device.

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Without hitting enter after typing in your username and password, in the password text box, append a comma (,) to the end of your password, then append phone as shown in the screenshot below:

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You should get a phone call on your main phone # associated with your two factor account. Answer this call and hit # to approve access.

If you prefer to use a 2 factor passcode from your Duo Mobile app, without hitting enter after typing in your username and password, in the password text box, append a comma (,) to the end of your password, then append the multi digit passcode found in duo mobile as shown in the screenshot below:

Type in the account password, then, without hitting enter, append a comma (,) to the end of the password, then touch the light on the yubikey as shown in the screenshot and photo below:

Then hit the green light on your yubikey to authenticate: