-- Log into your email via the Outlook Web App.

https://email.wisc.edu/

-- From the email page click on the app launcher button (upper left hand corner).

-- Select the Teams icon from the Apps Menu.

-- Next, click the three dot menu (upper right corner) next to your avatar, then select "Download the desktop app"

-- Click the "Download Microsoft Teams for Windows" button

-- After the download finishes, click and run MSTeamsSetup.exe to install the software.

-- When prompted use your @wisc.edu account to continue

-- Enter your NetID credentials on the UW-Madison Login (SSO - Single Sign On) page.

Note:  You may also be prompted for MFA/DUO authentication.

-- After authenticating, the Microsoft Teams desktop app should open, and be logged into your account.

Also see:  

Install Microsoft Teams - from Microsoft
https://kb.wisc.edu/124564

Download Microsoft Teams (direct link)
https://www.microsoft.com/en-us/microsoft-teams/download-app