When you sign in to Microsoft 365 for the first time, you will need to authenticate yourself using another method in addition to entering your OST password. Please have your mobile phone ready for the following instructions!
Using your default web browser, open the Microsoft 365 login page: https://portal.office.com
Important
If you are already signed in with another Microsoft 365 Account, click on your profil icon and sign out
After you signed out you can use another account and log in with your OST account
Log in with your OST account access data, which you received in the Welcome to OST e-mail to your private e-mail address
Provide additional information to complete your registration. The easiest way is to have an SMS sent to your mobile phone
- Registration is complete
Step 2: How do I change my OST password?