Something here may help.
https://support.microsoft.com/en-us/help/12440/windows-10-activate
--please don't forget to Accept as answer if the reply is helpful--
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I reset my Laptop but now I don't have the product key to activate my windows. And now I am unable to activate my windows. How can I activate my windows?
Something here may help.
https://support.microsoft.com/en-us/help/12440/windows-10-activate
--please don't forget to Accept as answer if the reply is helpful--
@lavanya khati
Hi,
You could refer to the following methods to reactive your windows:
Press Windows key + X
Click Command Prompt (admin)
Enter the following command:
wmic path SoftwareLicensingService get OA3xOriginalProductKey
Hit Enter
The product key will be revealed, copy the product key then enter it
Click Start > Settings > Update & security > Activation > Change the product key then enter the new product key then click Next to Activate
If you are unable to activate Windows 10 after all the above and you are certain you have the correct edition installed, then please attempt phone activation:
Activate Your Windows 10 License via Microsoft Chat Support
Hope above information can help you.
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Hello,
Please run Activation Troubleshooter:
Let us know if issue still persists!