Main download page:

https://teams.microsoft.com/downloads/

Deb installation of latest version:

wget --trust-server-names "https://teams.microsoft.com/downloads/desktopurl?env=production&plat=linux&arch=x64&download=true&linuxArchiveType=deb"
sudo dpkg -i teams_*_amd64.deb

Repository page:

https://packages.microsoft.com/repos/ms-teams/pool/main/t/teams/

Repo install:

sudo apt-get install debian-archive-keyring
wget https://packages.microsoft.com/keys/microsoft.asc
sudo apt-key add microsoft.asc
rm microsoft.asc
sudo sh -c 'echo "deb [arch=amd64] https://packages.microsoft.com/repos/ms-teams stable main" >> /etc/apt/sources.list.d/teams.list'
sudo apt-get update
sudo apt-get install teams