Hi, if you download a small program called Produkey (Google it and it’ll take you to the page) and run it, it’ll display your COA’s for all your Microsoft products. Hope this helps,
My Dell desktop currently has the Windows 10 Pro which is upgraded automatically from the original Windows version. Now, I want to install the Windows 11. To do so, I need to provide a Windows product key, which is not Windows product ID. I learn that a product key of Windows 10 can be used for Windows 11. Microsoft says that I need to ask the PC manufactory for the key. My Dell desktop is no longer under the support service. Where can I find the Windows product key?  
Where can I find the Windows product key for my Dell desktop?