After completing this how-to, you will know how to change your default DUO authentication method (Push notification, Phone call, etc).
Visit the MyIWU Portal. Enter your IWU credential and click Sign In.
Click on Settings.
Click on My settings and Devices. Duo will ask you to verify your identity before going to the next step.
Click on the drop down menu under "When I log in:" and choose the desired authentication method. If you would like to receive a Duo push notification instead of a phone call, choose "automatically send this device a Duo Push".
Select the save button