Learn how to quickly block a user from signing into Microsoft 365 to prevent access to company resources while preserving their data for further actions such as delegation, backup, or account review.
- Go to the Microsoft 365 Admin Center:
https://admin.microsoft.com - Navigate to Users → Active users
- Search for and select the user you want to block
- In the user panel, select the Account tab
- Locate the option Block sign-in
- Toggle the setting to Block this user from signing in
- Click Save changes
- Confirm that the user status reflects as blocked
- (Optional) Verify that active sessions are revoked by resetting the user’s password or using sign-out options
- (Optional) If further access is required (e.g., mailbox or OneDrive), assign delegates or permissions before or after blocking access
Reference:
Prevent user sign-in and block access to Microsoft 365 - Microsoft 365 admin | Microsoft Learn
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