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If you have Office 365 on your Mac, open Outlook it should prompt for your email - use your NetID@wisc.edu for your email (even if you have a firstname.lastname@wisc.edu do not use that format), it will then run through the setup and the NetID login page for Duo will come up - login and accept the Duo prompt to finish setting up the account in Outlook. It may take a little time to finish bringing in all of your email and calendar items, usually things start appearing right away, but it may take 15 minutes or more to finish getting everything.
Step by step directions are here: https://kb.wisc.edu/page.php?id=44798
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