​Your first login to Office 365 is a two step procedure. The first step is the Microsoft Office 365 login page -  https://login.microsoftonline.com - and the other step is a MacOs login-box. Clicking the link you should see the following login-box.

 
How-to

1. Enter your school email address given to you by your learner/teacher or local servicedesk
   It is also your Office 365-id

After a few seconds you will se the following login-box.

1. Enter your school email address given to you by your learner og local servicedesk
   It is also your Office 365-id
2. Enter your school password
3. Click on "Sign in"