Hi BaLe-3864!
Does this issue persist only on Ubuntu 20.10?
Does anyone else have the same issue?
In this case, we recommend you try to uninstall Teams for Linux app and install it manually by running the following commands:
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