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• Using your default web browser, open the Microsoft 365 login page: https://portal.office.com
  
  

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  If you see the Microsoft 365 portal below without signing in, then you are already signed in with with another Microsoft 365 account and you have to sign out first. After that, please click forget this account and sign back in: Image Removed Image Removed

   

  Account, click on your profil icon and sign out Image Added After you signed out you can use another account and log in with your OST account Image Added

   

• Log in with your OST account access data, which you received in the Welcome to OST e-mail to your private e-mail addressSign in with your OST account:

  
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• Provide additional information to complete your registration. The easiest way is to have an SMS sent to your mobile phone:

  
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• Registration is complete

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