During updates to Microsoft 365 or our My e-securemail application, you may encounter display issues or connection problems with the server.
In most cases, this is caused by the Outlook or Teams cache.
Clearing the cache can resolve this issue.
To do this, run the following command:
%LOCALAPPDATA%\Microsoft\Office\16.0\Wef\
Then delete the folder.
Restart Outlook and sign in again.