Microsoft 365 - How To
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      Disable User sign-in

      If you need to disable access to an account, one method is to block the account from signing in. To do this:

      1. Sign in to https://admin.microsoft.com using an Admin account.

      2. Select Users > Active Users. Select the employee that you want to block

      3. Click Edit next to Sign-in Status > then choose Block the user from signing in > Click Save

      If you block a user from having sign-in access to Office 365, it might take as long as 24 hours to take effect on all that user’s devices and clients.