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Hello, thanks for entering in contact here on our community

My name is João, I'm a Xbox gamer just like you and I will be glad to help you in your matter today!

I'm sorry you are having problems to log in to your account after you changed to Windows 11.

Please try this troubleshooting:

On the Desktop, press the Windows + R keys, type msconfig and click OK;

In the System Configuration window, click on the Services tab;

At the bottom of the screen, check the Hide all Microsoft services box and click Disable all;

Now click on the Program Startup tab and Open Task Manager;

When loading the task manager, click on the Startup tab and disable all non-Microsoft programs (right-click on the program and choose disable), Close the Task Manager and click Apply and OK;

Restart the computer.

Note: This procedure disables all third-party services and programs. You can later, if the problem is solved in this way, enable the programs and services that will start with Windows, selectively, instead of keeping them all disabled. If the problem returns after activating the initialization of a specific service or program, the problem is precisely with the initialization of this software and it is recommended to remove it.

Hi

Welcome to Microsoft community.

Have you tried to re-register the store app to check?

• Open the Start Menu, type PowerShell, right-click the top result and select Run as Administrator. Accept the UAC confirmation prompt when it appears.
  
• Next, paste the following in the PowerShell window and hit the Enter key:
  

Get-AppXPackage -Name Microsoft.WindowsStore | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml” -Verbose}

• Once the task is completed, reboot the system.
  

At the same time, I found the following two similar threads in the forum for you to refer to.

Windows Defender: This app is turned off by group policy - Microsoft Community

Windows defender is stopped by group policy - Microsoft Community

Keep us posted if you encounter any challenges along the process.

Best regards

Derrick Qian | Microsoft Community Support Specialist

Around sept. 1st we had an xbox live service outage please visit out
Live service status page to check if any of our systems are having issues.

Solutions:

1. First turn off and unplug your console for 30 seconds. Try again.

2. Redownload your profiles if you can:
http://support.xbox.com/en-US/my-account/manage-gamertag-and-profile/add-remove-account-xbox-one

3. Check for any system updates here: Settings > System > Console Info > Updates > [look for "update pending"]

4. Reformat your console keeping games and apps (requires account redownload as well): Settings > System > Console Info & Updates > Reset console > "keep games and apps".