These pages are out of date. Please use the following link to get the latest information about Office365: https://www.zi.uzh.ch/en/support/Outlook-und-Kollaboration-Office-365.html

Here you will find the most important information regarding Microsoft Teams, which is part of Microsoft 365:

Three variants for the access from guests to teams

• If signing in to the locally installed Teams App does not work at all or does not work as usual.
  Reset Local Teams Client