If you get white or blank screen after TEAMS upgrade, one fix seems to be to install older version teams_1.4.00.13653
1. Remove Teams
su
apt-get --purge remove teams
2. Remove all Teams and Microsoft config files from ~./config and ~./cache
3. Download and install teams_1.4.00.13653_amd64.rpm
https://packages.microsoft.com/yumrepos/ms-teams/
rpm -ivh teams-1.4.00.13653-1.x86_64.rpm --force
Edit: teams-insiders-1.5.00.9652-1.x86_64.rpm may be a better choise, because it works and it does not disturb update manager.
Installation via terminal:
su
rpm -ivh teams-insiders-1.5.00.9652-1.x86_64.rpm --force