I do not see the 'Device Security' Page

After logging in into my account,  Under 'My Account', 'My Subscriptions' I do see the Serial number and Key of my Norton Secure VPN on a Windows 11 system but not the devices (5) which I have  added.

I would like to remove a Windows system which is broken.

Please try Method 2 

Remove a device from your Norton account
If your license is installed on an unused device and you want to remove it, you can do that by removing the device from your Norton account. Once you remove the device, you'll no longer have protection on the device. The removal only deactivates the services installed on the device and does not uninstall the application.

If the device that you remove is not connected to the Internet, Norton completes the removal process when the device connects to the Internet next time.

You can use one of the following methods to remove a device.

Method 1 ›
Method 2 ›

Need more help?

  • Uninstalling your Norton product for Mac

  • Uninstalling your Norton product for Windows

  • Transfer your protection from one device to another device

https://support.norton.com/sp/en/us/home/current/solutions/v53370992

The Devices page in your Norton Account is notorious for being incorrect. 
To get an accurate list of devices, log into your Norton Account and click on the user icon at the top right, then click on Manage My Subscriptions. Then find your current subscription and click on Manage Licenses to see the list of devices activated on that subscription. (credit peterweb)

Method 2 ›

  1. Go to the My Account page.
  2. In the My Subscription tab, under the product name, click Manage Licenses.
  3. Click the trash icon next to the device that you want to remove.
  4. In the confirmation screen, click Remove.

 

https://community.norton.com/en/comment/8550535#comment-8550535