Windows 10: "Activate Windows" keeps popping up despite valid product key

I have a valid Windows 11 Education product key that I acquired from a university. Every so often, my PC will display the "Activate Windows - Go to Settings to activate Windows." in the bottom right corner. I then have to go to Settings, click "Troubleshoot" and then my Windows will reactivate. I can also run "slmgr.vbs /ato" and it will reactivate my Windows.My product key is a legitmate, first time install, retail product key.I have tried reactivating with Microsoft Activation Scripts MAS but it also happens with that.The message pops up every few days after reactivating Windows, sometimes

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Windows is not activated with valid product key

I bought this license and activated this Windows like 1 or 2 years ago, and it's a valid key, I had my Windows Activated and everything works perfectly until today when I saw a watermark at to bottom corner asking me to Activate Windows.

I tried to reenter my product key but it says that I do not have a valid product key and refuse to activate my windows

Is there any solution for this?

P.S. I didn't reinstall my Windows or make any hardware change

 

Pop-up window saying:The product key cannot be used on this computer

I've just received this pop-up message saying The entered product key cannot be used on this computer,while my product key is 100% legal,I've got my Genuine Windows 7 Home Premium from pre-order..anybody knows whats behind this??It just came so random,cos my Windows was fully activated..

 

Windows is not activated with valid product key

The same with me exactly today. I made a call to Microsoft and they ask about my phone number, my email, and name just to say that they cant do nothing at this time, cause a problem is really happening with the activation center server. Unbelievable.