You might face problem using Office 365 that you sign out your account but as soon as you open the program your account is logged in again. It makes your system vulnerable to data hack. For example: your laptop might be stolen somewhere and by luck if the person who finds your system is able to login to the system. Now, your connected services like One Drive etc. are also accessible to him. Therefore, it is very important to fix this problem of auto-login.

To resolve the issue, follow these steps:

  1. Go to the Office 365 homepage.
  2. Click your profile picture located on the top-right corner of the screen and select Sign out.
  3. After logging out, you will be brought back to the Office 365 login page.
  4. Every time you log in to make sure not to check the Keep me signed in an option that way we can stop the auto-sign-in of your account.

PS.

To access the Office 365 login page, please click this link.

Make sure to log out first before accessing the link.