sudo apt-get update && sudo apt-get upgrade -y
wget https://packages.microsoft.com/repos/ms-teams/pool/main/t/teams/teams_1.3.00.30857_amd64.deb
sudo dpkg -i ./teams_1.3.00.30857_amd64.deb

Alternative Method

curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
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 update
sudo apt install teams