Office 365 maintains users' login sessions. After a user has signed out from their device, the user's session can still be active in the Office 365 server for a long period of time. If you need to get an user sign off Office 365 immediately, you can use the  Revoke-AzureADUserAllRefreshToken cmdlet in PowerShell.

Reference: How to kill an active user session in Office 365


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