Windows 10: windows suddenly lost my product key

I had Windows 10 Pro installed on my computer and did the free upgrade to Windows 11 a year ago. It has worked fine all this time until this morning its now saying that Windows is not activated. I tried using the troubleshooter and it just keeps saying no product key can be found even though its worked for the last year with no problems. I haven't changed any hardware in my computer. I tried reinstalling windows thinking that might correct the error and it didn't help. I have a Windows 10 key but that doesn't seem to help it. The only advice I keep getting from Microsoft is to use the troubles

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Lost Windows Activation Product Key

I recently lost my Windows 10 pro Activation product key and now Microsoft wants me to activate my windows but now i dnt have any product key please suggest me the way i dnt want to lost my all data...

 

Lost of Product Key

I bought my Laptop in July 2015 with the Home and Student Microsoft Word. When I refreshed my computer I lost the Product key and I could not find the CD that contain the product key. What shall I do please suggest and help.

 

Activate windows 10 after re-installing (I have lost my product key)

I own a Lenovo T430 laptop. In 2017, I installed Windows 10 using my original Windows 7 product key. Unfortunately, I cannot find that product key anymore. I need to re-install windows 10. Will it be automatically activated after the installation, if I skip the step of asking the product key during the installation?

In my opinion, I believe that my laptop will have a digital entitlement stored on the Microsoft Activation Servers and this will not be a problem. Is that true?

If not, please suggest me a solution or a workaround.