How to Fix Unable to Sign into Microsoft Defender on Windows 11

Can't log in to Microsoft Defender in Windows 11/10? don’t worry! This article provides quick solutions and analyzes possible causes. Microsoft 365 subscription users can use the Microsoft Defender app on Windows 11/10 computers, which works in conjunction with the Windows Security Center to provide web protection, real-time security alerts, and other important security tips. However, some users reported that they could not log in.

Method 1: End and restart Microsoft Defender

A temporary failure of the Microsoft Defender application may cause it to fail to connect to the server and verify the login credentials. In most cases, restarting can solve the problem. The steps are as follows:

1. Enter Task Manager in the search box and open it.
2. Find Microsoft Defender in the Process tab, right-click and select End Process.

3. Restart Microsoft Defender to see if the problem is resolved.

Method 2: Try another Microsoft account

If you cannot log in, try to log in to Microsoft Defender using a different Microsoft account. You can register a new account on the Microsoft official website.

Method 3: Repair/Reset Microsoft Defender

Network problems with Microsoft Defender applications can also cause login failures. Try resetting the app:

1. Press the Windows I key to open Settings.
2. Go to Apps > Installed Apps and find Microsoft Defender.
3. Select "Advanced Options", go to the "Reset" section, and click the "Repair" button. If it is invalid, click the "Reset" button and confirm.

Method 4: Check Group Policy Settings

Local Group Policy Editor settings may prevent login. Check Group Policy Settings:

1. Press Windows R to open the Run dialog box.
2. Enter "gpedit.msc" and click "OK".
3. Go to the following path: Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Anti-virus
4. Find the "Close Microsoft Defender Antivirus" setting.

5. If enabled, double-click to select the Not Configured option. Click OK.

Conclusion

When you cannot log in to Microsoft Defender, try the above method. To better protect your computer, it is highly recommended to use MiniTool ShadowMaker to back up your computer.

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