It is possible to import users from Office 365 or using a CSV from, with or without password and from Office 365.

First navigate to the "Settings".

Navigate to "User & groups" > User management". 

To import users from Office 365, click “Import”.

After clicking “From Office 365” you will see a list of your Office 365 users. Select which users you want to import and click “Import”;

The users are now successfully imported, click “User management” to see the active users. By default, users will receive a registration email.